Uh-oh...."somwhere between Yom Kippur and Succos"....uh-oh....
From where I am sitting (the kitchen table right after breaking my fast ;D), it seems to me that you have at least two choices:
1- "Damn the torpedoes! Full speed ahead!!! L'Shem Shomayim!" Well, that approach has not served you very well yet for a bunch of years. But who knows? "Maybe if I try the same method again, I'll get a totally different result this time?" OK, that idea is pretty dumb, so here's the second option, and it's really ludicrous:
2- Give your competition with lust up completely - true, we pervs can't afford to use the schmutz, but on our own we are guaranteed to flop and use it again eventually (as you stated) and staying clean today is going to have to be a miracle - a real one, not just a figure of speech - so you get no s'char or credit at all for staying clean, at all (besides staying clean!);
AND (here comes the really annoying suggestion) give up on reaching 90 days....no, I do not mean "go flop on your face and use schmutz." What I mean is: consider stopping counting, at least till Pesach. For some people counting works great - but if the mounting "day#" is accompanied by mounting 'tension' - be it mental or physical - that means to me that counting is poison for you. It also might mean that getting to that # has become a lust itself and gotten a life of it's own. And that may not serve you well, as you might be finding.
Hey, you asked for suggestions, not me!
I do not know what is right for you, and there are certainly other approaches than mine. I come from a narrow band of addiction and recovery, so sitting here in my kitchen and sharing my own experience is all I can do.
We just finished Yom Kippur. We are clean and He has given us tremendous bracha and has set up all kinds of help the year through for growth and success in ruchniyus and gashmiyus, so go and do what is truly best for you. Don't wait, and don't wast time with plans that have a horrible track record - try something new and stick with it long enough to give it a real shot.
As far as the contact people you mentioned in another post, how do you feel about a few phone #s? Let me know, OK?
Hatzlocha sweet yid!