Figured wood is more likely to fret than regular wood even if it is from a proven bowwood species.
Sometimes you can get away with it other times you don't, no real rhyme or reason.
Your bow has a pretty decent tiller, so I don't think its your skills. Maybe if the limbs had been a lot wider it might not have fretted.
Wood can be so unpredictable. I used one species in backed bows a few years ago, saffronheart. Curly board, light curl compared to your wood, narrow ELB bamboo backed, no chrysals.
Another slat, not curly, a couple of pin knots, not raised, no frets. Then another with pin knots, not raised . It chrysaled at low brace height, despite being smooth and evenly tillered, no low spots. Left a bump at this spot during weight reduction, no increase in the chrysals size.
Next bow and all since have pin knots compensated for with small bumps on the belly, no chrysalling. All slats were re sawn from one very large, long board.
Hamish.
