The best I have managed is 60min subs with only slight elongation. I have managed an aspect of 16 with 40 min subs but I do tend to get 10-12 as an average even on shorter subs. I do think that I am suffering of differential flexure more than anything in this case. Planning on upgrading mount as well but probably not for another 7 months (next financial year) at least.
As for PEC, if you park your mount at the end of every session you SHOULD be okay. I've never done PEC training myself so I am going to leave it at SHOULD
