Need some input on springs. Cam will have .620 lift. I've looked at PAC 1518s (which supposedly you can use stock retainers with) and a few others. Any input here? The springs are rated to .650, but I'm not sure I trust a beehive even at .620. A dual spring would probably be the way to go, but if you guys have had success, I'll go with the PAC. Patriots are on backorder from what I hear....