I don’t think the doubler is between the flex plate and crank, That would shim the flex plate farther out from the block plate. I thin you should spin the engine around and see if the torque converter is in correctly. I’m thinking the drain plug in the torque converter is not clocked in the hole for it.
It also could be that the torque converter has ballooned out and is pushing out he flex plate. But that is not highly likely. I also have some concern as to why the block plate is bowed away from the transmission in the first picture.