The more you stretch, the better. I agree with Tomray generally.
Keep in mind that your penis will tell you how much stretching it can take. Everybody is different.
BPEL 7 EG 5.5 NBPEL 6.5 Flaccid length 4.5. Started Jan 2015 at bpel 6.5 nbpel 6.0 and eg 5.2 flaccid length was 3.5
I have reached my goal. At least for now.