You need 256-257 sum for 715. You're at 248 (Q85+DI80+V83). That's 8-9 points across three sections in 6 weeks - very doable.
But here's what I'd focus on first: you scored 705 and 695 on mocks, then 655 on test day. That's a 40-50 point gap. Until you diagnose why that's happening, improving your mock scores won't help - you'll just have higher mocks that still don't convert.
Few questions to pinpoint it:
Were mocks taken in exact test conditions? Same time, no pauses, no phone?
What did you do the day before the exam?
Did you feel the pressure hit at any specific point during the test?
On section priority: your V74→V83 jump shows you can move sections quickly when you focus. Q dropped from 88 to 85 despite being your "stronger area" - that's likely pressure/execution, not ability. I'd stabilize Q and DI through sectional mocks (builds confidence under time pressure without full-test fatigue) before going back to full-lengths.
But seriously - solve the mock-to-real gap first. That's where your 60 points are hiding.