I reworked some of my earlier code.
-Changed how the regen works, it's generally accurate now though I highly suspect there's a variable in play other than level but I don't know it and level appears to make the majority of the impact.
-The reduction on jump server side is almost spot on now.
-Changed the invigor effects to reduce stamina usage instead of add to stamina regen, and added implementation for the endurance change effect.
-Along with that I combined the client endurance and mana regen so they would send fewer redundant mana change packets.
..and I think there was something else but I can't remember right now =x
http://www.hmproject.org/files/endurance_diff2.txt
Take a look and don't be shy about telling me I screwed up something.