OK, my question about lobe lift needs to be cleared up and you need to figure out/verify what lift you're actually seeing at the valve with the rockers you're using, what the actual coil bind height is with the retainers you're using, and what clearance you have before the retainer contacts the valve guide.
Those marks on the pushrods don't look like something I'd expect to see if the pushrod was rubbing on the head or inside of the guide plate...?
I wish you lived near me, I have the tools to test all of this except the coil bind height of the spring.
Take a spring and retainer assembly to a machine shop and have them test/verify pressures on the seat, pressure open at max valve lift and coil bind height with the retainer you're using.
Verify your installed height. Best done with a spring seat micrometer like this one but can also be done roughly with a caliper.
Get a set of lightweight checking springs and install them under your retainer. Check your retainer to guide clearance using a magnetic base stand for a dial indicator or a fixture for the dial indicator that screws into a valve cover bolt hole.
You can also verify the lobe lift of your cam with a dial indicator. Measure off the lifter. Zero the dial indicator when the lifter is on the base circle then rotate the engine 'til you see the max reading on the indicator.