I have an old-style toilet that has the tank bolted to the wall; there is a leak at the bottom of the tank when the toilet is flushed and water travels through the 2" diameter pipe into the bowl. There is a slight vertical misalignment between the tank and the bowl (about 3/8" over a span of 5"), and the new neoprene washers, tightened down hard, don't quite stop the dripping when the toilet is flushed. Any suggestions?

Line the pipes up again and try tightening the nut now. Good luck, Tom