Smell the boar. Butcher him without castrating him and that's what the meat will taste like. Personally, whether you castrate him or not is up to you. Sounds like he isn't going to be a breeder, so he isn't worth anything else. You might just as well get rid of him, because his feed conversion is just going to get worse and worse as he gets larger. I'd also be careful feeding and working around that boar if he weighs 275 lbs. Breeding age males (be it a boar, a buck sheep or a bull) can be aggressive.
You could butcher one of the gilts; they are about finished (market weight).
For future reference: 150 lb. pigs are too small to be breeding age. I like the gilts to get up to 250 lbs. before breeding and I wouldn't want a boar under about 300 lbs. I'd prefer that the boar I brought had bred some gilts/sows before I got him.
If you don't want to castrate pigs, make sure you get gilts or pigs that were already cut (barrows).
If you got those pigs in mid-April and they weighed 150 lbs., that means they've gained only 100 lbs. in 5.5 months. That's a pretty low rate of gain.
I don't understand what the problem is with castrating an animal, be it a horse, sheep, pig or calf. It's a part of farming: you don't want uncut males breeding your female stock, and the gelding, wether, barrow or steer will gain better if castrated.
If I told my wife I couldn't castrate the pigs and she'd have to do it, she'd laugh herself silly.