I'll probably get someone mad at me about this, but....
Assuming that a HD shotgun is part of your home insurance plan, use that.
I quit shooting IPSC long ago, the day I first saw someone win a match with a handgun I wouldn't carry on the street. While IPSC matches can be fun, they bear the same relationship to defense medieval jousting did to medieval warfare.IOW, it can get you killed in real world situations.
So, if you want to get better with your WIHTF shotgun, go ahead and shoot some IPSC, trap,Clays or other artificial game.Have fun, ignore the scores, and enjoy while your proficiency improves.
OTOH, if all it is is a game,and you like competition, get a more specialized shotgun, and accept the fact that it's just a game. While no Semi auto maven, I'd go with the 11-87,to the others mentioned also seem to be OK.
I'll probably do an informal "Serious" shotgun match or two over the winter.That's in addition to slug hunting deer, goose hunting, vermin control, some clays, and maybe some trap. I'm not that keen a competitor, and I'll use 870s. Nobody there will greatly outpoint me, and nobody will have more fun.