Vic, you flashed a Southcoast HU-NW set and it sounded like you were trying to tune it gCEA. Is that right? Those are supposed to be dGBE. If you really tried to go gCEA, I'm surprised they didn't snap or rip the bridge off. I have those strings on a 17" tenor tuned dGBE and they are on the loose side, so I'd expect them to be tighter on 20" but hopefully not as bad as you found them.
That's good to know that the Worth BT-LG worked at GCEA. I find it strange from
their chart that the same gauge is listed in so many sets. But hey, whatever works. I might give those a try for Bb tuning on my Ono at some point.