if it is too much variance depends on your bankroll. If it is too much money, just go to holdem a few hands after you got up to 700.
Apart from that getting it allin pre is perfectly fine. Especially live people can show up with all kind of trash.
Just flatting the 15 and waiting for someone especially the maniac to reraise is a decent play this deep. If everybody just calls a lot of good things can happen especially:
-top set would be very hidden now and you might win a big pot here and there
- you can extract a lot of value from smaller flushdraws/flushes
