Neil R

Are you gaining from it??
That is the most important factor.
The only problem I can see is that triceps are getting hit three times and biceps twice so their is a potential problem of overtraining those bodyparts. Plus training Shoulders the day before chest can limit you chest workouts.

But, that being said, if your making the progress you desire then it doesn't matter what anyone else thinks.

Also, the weights used are pretty irrelavant, as its the tension within the target muscle that matters.