What’s the tyre you have on the front?
I went through a phase of exactly this – disc brake and Fire XC Pro on a front wheel. Basically, the bead on the tyre is sufficiently loose that it slips under braking – the tyre doesn’t slow as fast as the wheel, essentially. If the inner tube goes with it, bingo, torn inner tube.
I tried various solutions: reinforcing the inner tube round the valve with squares of other inner tube (not the same inner tube, that’d be a bit pointless) didn’t work massively. Not using the valve locking nut helped a little; talcing the inside of the tyre did work better.
But after a while I gave up – the cost in inner tubes was mounting up, so I just bought new tyres (Bontrager), and didn’t have the problem again.