Man I really hate to see you have these issues on a system that can work sooooo great with the factory oiling. I'm going to say I have 1000 plus runs between 8.40 and 9.10 with the stock non-pushrod oiling set-up. Never once hurt a pushrod or a lifter. I love simplicity. Only issue I had was to much oil so I put a restrictor in the back of the block and ran the heck out of it. I hope your luck turns around