If you are willing to leave the New Jersey area there are quite a few places that are likely to hire you with 300TT. Check these out:

Sky Diver Driver

Dropzone.com: Skydiving Community, Skydive Information

U.S. Parachute Association > Find a DZ

Many of the jobs posted at skydiver driver require 500 tt but some don't advertise their minimums and might be the ones who will hire at 300TT.

Good luck!