We put that wording in the talents because those spells can be used against creatures, so they won't always necessarily deal that % of damage when used.
"Up to" is to imply that, say, Greater Pyroblast won't really do 35% of a world boss' health (for obvious reasons).
Quick clarifications (all still subject to ongoing change), since this build was in a slightly intermediate state.
--Sins isn't correctly working in this build. The buff appears, but isn't increasing damage or Atonement.
--Tuning is pretty preliminary, but for context on the 75 row, Contrition is likely too strong, because it skews the choice between the modes of Penance too much. Contrition's heal should be weaker than a Penance Atonement, so that it's still a choice about doing more group healing vs. focusing on one target.
--Also on the 75 row--we're currently planning to replace Orison with Shadow Covenant.
--Luminous Barrier is still intended to replace PW:Barrier, as before.
--Current plan is to buff Shadow Mend a bit, as mentioned yesterday. Less sure about PW:S after reviewing more. Shadow Mend was more strongly propped up by Grace.
We're seeing all the feedback on relative balance of talents within a row, but I don't want to make any claims or promises on which talents might eventually land higher/lower. We just rearranged a lot, and whatever I say will probably be proven wrong once we give a more thorough look and heavier testing happens on beta.