The current set up for Regeneration boon seems to be out dated to both out going healing strong reg skill and runes that bluntly buff the reg effect.
Per wiki: Regeneration is a boon that grants healing over time. It stacks in duration. The boon with the highest healing contribution is used before other lower healing power applications. Only healing power affects boon prioritization; healing modifiers do not.
This means that a class who has the highest healing power gets the reg ticks even if the reg it self from the skill or out going heal effects has a higher tick. So your in effect loosing out on a way of playing the game only because of build in healing power effects (such as a class getting +250 healing power). This seems like a comply out dated effect that needs to be fixed as it remove a massive part of skills for classes who simply do not get as much "free" healing power + effects.
Regeneration should tick for the highest amount NOT the highest healing power or your making skills that are balanced with a high reg tick in mind invaded.
See ELE forms and you will get my views.