Skylark, Kermie
Agree on g/s angle - I use 5-6 degrees personally, but what Evo is describing sounds like an unstabilised approach and it is unsettling him. Also, as I said, flying a SEP is about feel and you don't need to nail the numbers, they are there to guide you.
IMHO he needs to find a rough rate of descent that gets him "in the slot" and allows him to be relaxed for the flare.
To nail 6 degrees, simply add a zero to groundspeed - e.g. 600-650fpm for a Warrior, but my gut feel is that is a bit on the steep side for a student and there is a danger of the a/c "running away" unless this is a well managed glide approach.
However, I know that you a re an instructor Kermie (don't know about you Skylark) so perhpas I ought to bug out now and leave to people with more knowledge and experience.
I just feel for Evo, especially as I struggled with landings too..