I attended two of the old (prior to 1980) Mopar drag race seminars that Mopar use to put on, Tom Hoover spoke about the valve and rocker arm sweep pattern and they like to see the pattern start on the inner (closer to the rocker shaft) 1/3 of the stem and then sweep across the center of the stem and end up on the outer 1/3 of the stem at max lift, that has worked very well for me for a lot of years
You can use dykem or grease to check the pattern, set the lash first and then check it out
I have had a little valve stem and keeper groove issue with lash caps also, but the open pressures where above 830 Lbs. and I was shifting the motor at or above 7000 RPM