Cool. We are running almost the same setup then. I too have slp race twins and highflow,flowrites, slp heads 3-6000',ect.. I also have union bay porting. Believe it or not, I am running 370 mains at 0-4000" and am still on the fat side. That would put you more like 340-350's.
Clean your secondary out good. The delrin washers are just a thin plastic washer. They come in packs of 3 from most places. Some sell them per each. I put one on each end of the spring, and one between the spring cup and the clutch half. They act like bearing so the spring does not bind in there when the clutch faces twist as they open and close. They work much smooter with the washers in there. I would also suggest an slp green/pink primary spring. Really wakes up the bottom end, and helps it to backshift as well at slower speeds. If you are running stock drivers, the 19/43 is a huge improvement. I just went with 7tooth 3" pitch drivers in mine as I put a 2.5 camo-x under mine this fall. It really came on strong down low, but seemed to lack a little higher up so I went back to the 19/39 and am happy with that. I am running 66 gram weights, but do to the elevation, I would think you are correct with your 62's.
