tbb is overwritting my bridges in torrc with the default bridges. what the hell?!
i can't get rid of obfs4 settings in tbb. i tried editing torrc directly. i tried clicking open settings then connect directly. whatever i did tbb always recreates torrc with the default three obfs4 bridges
ok, finally got it to work, i had to click open settings and configure, then select no for the isp question.