It would reasonably seem your options would be to buy different pants (the belt loops are located in different positions among the brands I wear, so I understand your situation) ... buy a different holster ... or, adjust your draw/presentation to accommodate reaching slightly more rearward (training & familiarization issue).
FWIW, switching back and forth among the leather & plastic holsters I typically use (depending on activities, clothing, pistol choices, etc), I've had to reach slightly more forward or rearward upon occasion, or adjust to a slightly different cant, and it's only been a minor training/equipment consideration.
Kind of like when I was originally having to train myself to adjust to slightly differently positioned, raised and/or canted holsters depending whether I was wearing my gun belt (in uniform), an off-duty holster/belt or later on, for plainclothes (when my dress slacks often had belt loops located differently than my jeans).
In those instances my learning to adjust to the different equipment combinations seemed to me to be a potential matter of life & death, since I might have to use any of them under different circumstances on & off-duty.
For competition venues? Suit yourself. You're the one going to be using it. You might find a differently positioned/canted OWB or paddle holster might actually suit you better, at some point.
Oh yeah, for a couple of paddle holsters that have to straddle my outermost hip belt loop because of their width, I simply position the holster to do so. But then, I don't have to take gaming rules into consideration, either.
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