Profesional football has mastered the kicking game far an away from High School and college. Therefore, the kicking game should be more at a higher level.
1. The PAT is from 20 yards.
2. One point if on kick off no run back.
3. 2 point conversion stays the same.
4. Receiving team is ten yards further back giving the onside kick a better chance.
Another option would be to have less than 11 men on the kicking team to allow more potential for blocked kicks.
Good suggestions—as the PAT is less automatic in High School and college, and the rules ought to be roughly the same at every level, change should be in the direction that you indicate.