What do you think about the % values for those 2 skills in feast?

It is for both skills 25%, it is used to survive enemy burst, but I see it often fail to do so even when used perfectly. The damage is too high if you manage to get a good/ok burst.

Players are often not backing off and burst into the target with the buff anyway, because they see it is still manageable to get a kill, a synced burst with healer under cc is more valuable than waiting for another chance until it runs out.

Bad play/Bad awareness should be penalized in a PvP mode, yet in the current "synced burst Feast" it is not really important to keep track of those skills.

I would increase the % values atleast to 40%, the buff is only for 10/15s anyway.

Give Feast more depth with that change and not skills that are far away from the realistic gameplay.
If a city is on fire you don't take the kids water-pistol and try to extinguish it.

Make additional skills more powerful.