Have you considered that you are overtraining anterior delts? Doing 11 sets for front delts and only three for rear delts is not only unnecessary but can lead to an injury or at the least severe forward rotation of the shoulder. 19 total sets for shoulders is a bit much for a natural athlete considering the amount of work the shoulders get from benching movements and rowing movements. IMO, if you insist on doing this many sets, at least even it out a bit. What I'm currently doing:
3 sets each- military press, Arnolds, db side laterals, machine side laterals, reverse DB flies, reverse pec Dec. Get in and out in under an hour and use 2-1-2 rep timing. -EK

This is a lot of volume too many sets,why dont you try pre-exhausion,ie super set a isolation exercise with a compound exercise.here is a example.

1. lateral raises to sides.super set with front press.3x10

2.bent over lateral raises,super set with bent over d/bell row.3x10

Or if you do not like super sets try drop sets ie,shoulder press 10 reps
drop weight 8 reps
drop weight 6 reps
drop weight 4 reps.

These make your delts burn,also try these on other exercises.

Hey Bartsd, I also use have exercise with dumbbells and feel me fit and have some kind of the better feeling's......

Try 3/4 movements on your pressing exercise's,Also try j reps on some exercises,for those who do not know what j reps are,you simply do just the top half of say lateral raises for 8 reps then rest 20 seconds then do the bottom half for 8 reps,you can do j reps with any exercises,the burn is worth it.

Well it is fantastic exercise workout and thanks for sharing this as i was not aware of this exercise and got many new ideas about shoulder exercise so thanks for sharing this.