Stop timing your 3x3 solves for the final day leading up to comp. Do slow solves and make sure your look ahead is good and your solving every f2l case efficiently.
If there are any last layer cases that you mess up, make sure your finger tricks are good and drill them.
Other than that your...
COLL is the first set you should learn after you finish OLL and PLL, just make sure you're always spending time on f2l as it is the most important part of your speedsolve.
After COLL, Winter Variation (WV) and Valk Last Slot (VLS) can be fun to learn, and various OLLCP's, ZBLL's and even...
Learning Full ZBLL can definitely improve your times, but with cfop it will be difficult to keep all the lags memorized because they don't come up very often. Also if you want to make ZBLL very useful then be sure to learn edge control techniques in f2l.
Hope this helps!
As many before me have said, intuitive F2L gives you a better sense of how the cube works, many of the optimized intuitive cases are the same as the algorithimic cases.
Learning intuitively also gives your more finger trick friendly cases, as that's how your brain wants to learn them.
At the end...
If you know full OLL + PLL then you're good, just make sure you're using good finger tricks and good algs. COLL is useful if you want to learn another alg set, but not necessary.
It seems that your F2l is pretty decent for a sub 15 solver, but it could be better. However, from your stats given...
Chris Olsen (cyotheking) has a pretty in depth tutorial on the subject if you want to check that out.
However, I personally think that the best way to learn finger tricks is to just play around and figure them out for yourself. It's not as hard as it sounds and it will make you a lot better...
Focus on the fundamentals, while learning full oll+pll is good, its not the best thing you could be doing now.
Make sure that you are solving each F2L case as efficiently as possible, then wait for that to convert to muscle memory.
In LL, make sure you are using good algs and fingertricks so...