I think Remek’s and Iguana’s hypothesis is interesting. We’ve gone from looking at ligaments and tunica as limiting factors, now we have an additional variable, smooth muscle, to play with. Since my BPSFL is about 0.52 inches longer than my BPEL I’m a candidate for girth work, which is what I’ll be working on now and see where that takes me. I do very little girth work because my penis is very sensible and gets overtrained very very quickly (get bad EQ very quicly) which is why I concentrate on light slow jelqs and streches.
I’ll see if I can put a girth routine together which does not negatively affect my PIs.