That's a lot more timing then I'd feel comfortable running without more octane.
I know archer had good luck with more timing and good fuel but in my expirience I wouldn't go that high at least in the mid range. I start dropping mine at about 8k.
From what I've seen, you don't need additional timing at peak torque, you need a tad less to see more.. and depending on the variables, you'll want between 31ish and 34 or 35 up top.
I find it hard to believe that you've already pulled a few degrees out from the original map... I'd try pulling a few more and see what she does. Do I see 39 in there (I'm on my cell phone)... I wouldn't that personally, eveb with the good 93 I can get locally. I haven't seen any proof that you make any more power with that much, and then add the risk of detention.. yikes