oil COnsumption until 1 qt low

408 stroker smokes and burns oil at a rate 1qt 500 miles.builder says leakdown was less than 2 %.only thing he could find was less than enough sealant on rocker studs(magnum eddys)he ran it with the pcv unhooked and smoking stopped,told me to get a catch can.i did,very little oil being being caught.couple thimbles ,not a quart.funny thing is when i let it get a qt low it seems to stop using as much,how can this be?im not overfilling with oil.i dont think he was able to use the oil baffle as the scat crank wouldnt let it fit.anyone got any ideas?