It sounds like you have come to a plateau. If this is the case, you would be a great candidate for a one month break. Then when you get back into it. Change your routine from what you have done in the past.
You are more then ready for a more advanced routine. For the very best free forum on PE go to thundersplace.com

Another thing you may be interested in at this point, is an "All Day Stretcher" You can find many on the web, and some are rediculessly priced, whiles others aren't bad. Look on e-bay for them, you can find them pretty much anytime. Sizeon has one that looks very good. But don't get caught up in the promises they give.

If 8" is to big, or it makes you obsessed, then I too am in that group, as I want a minimum of 8" NBPEL, I am currently at 6.5" NBPEL, and started at 4.9". My BPEL is 7.1, and to me that is still short.