Why not implending this system in BG's, heres an example of it:
So we re in 10-20 bracket in a BG
Lvl -15 recieve a buff wich highens theyr health and theyr damage output.
lvl 15 dont get anaything (sorry 15's)
Lvl 15+ get a debuff wich lowers theyr health and theyr damage output.
so things will get pretty even and skill will matter, not the heilroomed lvl 19 who kills anything with but a shot from his 1handed wep.
EDIT: yes im butthurt.