I've only been noticing the missed reps as of late. If you're not able to progress then its time to make an adjustment.
If you go back to point I made about the program. If you're getting stuck alot then maybe its time to loosen up your program.
There is more than one way to skin a cat and there is more than one way to make progression.
One route is to break up the sets. Instead of doing 160 for all the sets, do 160 for the first 2 and 155 for the last. Follow that up next week by doing 160 for all 3 sets of 5.
You could even do 165 for 3 reps, 160 for 5 and 155 for 5. Follow that up with 165 for 4, 160 for 5 and 155 for 6 or 160 for 6.
Even if you take the last workout and add a rep to the last set you're progressing.
Dropping the weight down isn't the only answer, but its usually the easiest one. Not all easy solutions are the best one though.
BUT if you're looking for strength gains then you're looking for intensity.
The intensity you're using for a 5 rep set is not very high and, if you look at the difference between 150/155/160 the intensity is about the same (for arguments sake). And I would guess intensity is no higher than 80% but probably lower than that (70-75%).
SO if you're getting 155 but struggling with 160...It may be time to drop your rep range a bit and increase the intensity. I'm not saying you should start doing maximal singles, but maybe a few triples.
Hopefully you're starting to get the general idea and realizing that everything I've suggested breaks poor Ripps program rules. Send hatemail to me