The only time I've experienced regurgitation with my 2 year old bp was when he was in shed. Beyond that he's always been a great eater - I would pay close attention to husbandry before ruling it out but it could be an issue with stress from shedding.
I have another bp around that age and he's taking small mice, moving up to weaned rats as soon as I use up these last few mice, so feed according to the widest point of your guy's belly. However I've also heard that after waiting 2-3 weeks after the regurg, feeding a prey item a size down will help them take.
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