If the lash is moving around and the adjusters are coming loose it's a sign the pushrods are flexing.
You should at the minimum be using 7/16-3/8 single taper pushrods. I fought that same issue. If the lash is moving and the adjusters are staying tight it's another issue.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
