Sounds good. I think that is the way to go as duration of activity is the most likely culprit IMO.

BTW, do us a favor and separate your ideas into spaced paragraphs and use capital letters to start your sentences, as the way you're writing things it is difficult to read and decypher.

Some light reading.

From the International Federation of Sports Medicine:

Blood Pressure Response to Resistance Exercise

Though it remains a valid fact that blood pressure may reach extremely high values at certain types of resistance exercise, this cannot be considered as a general rule. Actual blood pressure response to strength exercise depends on following factors:

1. Exercise intensity (load or resistance used) There is a rather simple rule that blood pressure rises rather proportionally to the force exerted (Sale et al., 1993). The highest values are reached while applying maximal strength.

2. Muscle mass activated Though resistance exercise involving a small muscle group leads to a rather moderate response, activation large muscle groups while performing exercises like squat, leg press or dead lift is usually associated with more pronounced increase in blood pressure values (Benn et al., 1996).

3. Number of repetitions in a set at a given submaximal load, e.g. weightlifted, there is a steady increase in blood pressure with each subsequent repetition in a set (Sale et al., 1993). Its changes are usually closely related to the level of perceived exertion.

4. Type of exercise Blood pressure response tends to be higher during isometric as compared to dynamic forms of strength exercise (Mc Dougal et al., 1992). Lifting the weights elicits higher blood pressure than isokinetic exercise with the comparable force production (Kleinert et al. 1996, Sale et al., 1993).

5. Involvement of Valsalva maneuver Closing the glottis while contracting the expiratory chest and abdominal muscles in order to stabilize torso (necessary to provide support for the limb muscles especially during heavy lifts) substantially increases systemic blood pressure. Its increase is a prerequisite for moving the blood from heart to aorta and systemic arteries. Under such circumstances values exceeding 300 torr have been measured by invasive method in athletes performing heavy lifts (e.g. squat) with weights close to subject’s maximum. The same weight lifted without Valsalva maneuver elicited values by at least 100 torr lower (Narloch and Brandstetter, 1992). However, it should be noted that Valsalva maneuver activates also mechanisms, which can, at least in part, compensate potentially dangerous increase of blood pressure. It has been shown, the higher intra-thoracic pressure is transmitted through spinal nerve foramina into the cerebrospinal fluid in medullar space and cerebral chambers and further on also to cerebral tissues (Dickerman et al., 2000). Resulting force on external wall of arteries reduces mechanical stress due to increased intra-arterial blood pressure. However, though such compensation may be considered as a positive at lower intensities, extremely high values of intracranial and also intraocular pressure accompanying maximum strength effort remain a source of concern and should be avoided. If applied only for a short period of time, so that no serious impairment of venous blood return occurs, higher intra-thoracic pressure evoked by Valsalva maneuver exerts concordant “outside” force to...

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Given all that, I am fairly cetain that number 3 is the most important, and indeed this is just what a paper by the Journal of Exercise Physiology (online) concluded. This study was done on hack squat and legg press so it may seem different BUT their main purpose was to examine the effect of body position, where they found no difference. Squat may be a little different but IF your problem has to do with blood pressure response then it is most probably related to DURATION of exercise, and even 65% of max may be worse than 75....

If you think about it this makes sense because of the cumulative effect. Even a 1RM, no matter how important intensity may be to this equation, just can't have as much of an effect as something you do for a longer period of time. So my idea of it being related to higher rep squats is prob the most valid, so your plan to try lower reps is definitely a sound plan.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.