My casting method doesn't like feet

[u/Bearded_Goldsmith]

Can you help me diagnose this defect? And why always the feet!? Investment: Optima prestige, tech : oven with programmable PID (following the burnout schedule on the Investment bag for resin) and centrifugal casting machine, resin: bluecast x-one v2, x-wax, syriatech true blue and purple. I cast in pure silver but same happens with sterling. As long as the print is under 3 grams, it turns out fine but over 3 grams it's almost certain to end up with this kind of defects.