I agree - work with the burr oaks you have, cut around them to give them more light.

Also, if you must plant - go with some fast acting type trees like sumak, and some apple varieties.

Sawtooth oaks may work, but first crops are still 7-10 years off (2-3 times as good as White oaks).

BUT............ Plant White oaks for your grandkids - not for yourself.