Did you experience more growing pains when you were taking 500-750mg? If so then it would be the large dosage that's inhibiting growth.
I think it would be a great idea to do a mini detox! Check out crystalelle's thread where she talks about detox, dosage and other tips on BO 
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I have been trying PC for a few cycles, and most often my breasts shrink quite noticeably after applying it. I guess this indicates that I have the right amount of E and P, and any additional P only acts as an E antagonist. There was only one cycle when I had E dominance (mid-cycle spotting) when PC worked miracles for me. My breasts had a huge growth spurt. So the key is E/P balance!
You seem to have a solid plan and a great diet! Check out Missmadscientist's thread on diet. I mix whey protein with plain greek yogurt (30g of protein in one cup, and yummy too!), and drink it 30 minutes after taking BO. It gives me instant breast tingles.