Aluminum valley cover for trick flow heads

Well Maybe they opened up the holes. These heads we got may have been some of the first one's out. Our 3/8 pushrods rubbed on about half the holes requiring them to be opened up. Another ?. We put in a Hughes solid roller with alost .700 lift and we had to do a spring change for it. This thing seems like its binding the inner spring cause it gets tough to turn over at almost max lift. These heads we built by a good shop so I'm sure they checked for coil bind . Is this normal on a roller to get hard to turn by hand with that much lift and such a strong spring?