Hello sarahcsc.
I think probably the best way for others to critique your routine is to post pictures of your breasts in the picture forum every now and then.
Seeing as you're getting results I don't think there's a need to fine-tune your plan right now. I think it's when your growth has stalled for a while or you start getting unpleasant side-effects would you need to make a change.
When I started taking PM I also was taking 3,000 mg daily. I got good results after doing this for about 7 weeks, but then I started getting bad headaches so I cut down to 2,000 mg and started using progesterone cream. The headaches went away and I don't think I lost any of the growth I attained while on the 3,000 mg. You might not have this problem because you're using progesterone cream, while I didn't when starting on the PM.
I have never used PM cream and I haven't taken SP with PM so I don't have any critique on that, but I am sure others will have an opinion to share.