Are they free ranging with gilts ?
If not, you're risks are lessened
But, as you're discovering from their behaviour, they can get a bit bolshy as they start to mature - not always just boars gilts can do it too. That's usually what dictates it's time for them to go in my book.
When you send them depends on their weight and what you're wanting from them really - if it's pork you're after, aim for around 85Kg liveweight (at
approx 6 months) or if you're looking for bacon and bigger cuts aim for 100Kg plus which will take longer.
A LOT is written about taint - and a lot of folk can't smell it or aren't as aware of it as others. Me.... I can smell it at 100 yards lol! But I'm super sensitive in the nasal department
hubby and the kids don't seem to notice it.
HTH
Karen