I have no idea how spell coding works here..

But would it be possible to scale the affect based on recipients level?

I.E. Stay with percentage but have a higher percentage at lower levels?

As others have said to be noticeably effective regen needs to be 30k+ on tanks at 70. 

Gorrex a Necro..

Was in NEoP briefly but moved and quit playing.  Came back later and stayed for a long time, never was extremely hardcore during EQ.

Was in Primeval the longest I think.