Should I wait until I reach SPC to submit my WOFT packet? Is it worth it to submit one as a PFC?

Submit and re-submit if turned down. Don't give up.

I was selected as a PFC for flight school and never looked back. What have you got to lose by applying now? If you don't get selected just try again.

There are always people who will tell you to wait and gain more experience or to try different options. You will always always note that they are not warrant officers and that they have not applied to anything themselves because they are waiting for tomorrow. I also met with many of those naysayers once I was a warrant officer and they were still the same rank they were when they gave me their "advice."
If a program really required more experience or a certain rank they would put that in the requirements. If you meet the requirements then apply.

Good luck.

Personally, I would wait until you are a SPC. Based on board results over the last year, PFC's are very rarely selected (no joke, like maybe a handful in the last 7 boards). Unless there are simply no PFC's dropping packets, which I highly doubt.

Unless you're an older soldier with life experience and a college education to back you up, I'd wait. You're not an NCO, but being a SPC still looks better on paper than being a Private. SPC are selected all the time for flight.