One you get to being >90% from 22'-25' with your putting, the next step is figuring out what you need to improve to get that close to the basket.
What discs are you hitting that 330' mark with? Chances are there's still something fundamentally wrong with your driving form. Figuring out what that is and getting to where you're putting fairway drivers 350', mids 300'-320' and putters 250'-280' will improve your accuracy from 330' and down quite a bit.
I also agree with Omega that you should be kicking butt in intermediate if you're hitting almost all pars with a few birdies.
You are correct about that. I am still working on my driving form. I typically throw Vikings and Valks (around 170g) RHBH to these distances. I have been working on my technique and have recently stepped down to Leopards and TLs to build my form the correct way. I can get my Aviars out to about 230 pretty consistantly but have yet to work this form into my driving. If I could get my teeshots out to 350 or so with decent control that would allow me to get close to the basket to where I could throw for more birdies. It seems a lot of times that I find myself about 60 feet or so from the baskets for my second shot and I just can't seem to hit these shots. I will lay it up and take the easy par.