What are you trying to accomplish with this change?
It boosts healing martials at the cost of not healing fullcasters as much. Sounds good.
I don't think healing needs to be buffed for martials as it kind of messes with the healing economy a bit. However, it does seem reasonable.
My biggest issue is that I don't understand why you want to cap the CL based on the target's HD.
Of course, pre-calculate your "healing die" when you level to speed play.
I'm guessing this means "record your hit die, and average if necessary," rather than "pre-calculate an average result on your hit dice," but I would like to be sure.
Of course, pre-calculate your "healing die" when you level to speed play.I'm guessing this means "record your hit die, and average if necessary," rather than "pre-calculate an average result on your hit dice," but I would like to be sure.Yeah, that's what I mean. It really only matters for lots of multi-classing. Wizard 6 Cleric 3 MT 1 Evanglist 10 is 6d6+3d8+1d6+10d8. The average die size would be 7.3, which would become d8. Sorceror 10, Dragon Disciple 9 would be 10d6+10d20. The average die size would be 9, so round that to 1d10.
I imagine that most things would stay 1d8 (Channel would go up to d8) except the full on martials. It does mean that mass healing effects need to be rolled individually though.
NOOOO, everything in PF rounds down. (Except anything where lower is better.) The hit should become the lower one, IMHO, unless the fraction is truly small. Yes, it penalizes multiclassing, which I suppose reflects a bias of mine. But you're ignoring it!
Wizard 6 Cleric 3 MT 1 Evanglist 10 is 6d6+3d8+1d6+10d8 averages to 7.3, yes. That would either somehow result in 1d7 -- maybe a d6 & a d8 rolled together and averaged? -- or a d6.
Wizard 1 Cleric 19 would be 1d6+19d8, averaging 7.9. I suppose I grudgingly could accept that as a d8.
Sorceror 10, Dragon Disciple 9 would be 10d6+9d12. I'm not sure what you intended to type, but let's go with Sorc 10, DD 10, or 10d6+10d12, which averages to 10d9 as you say. It should NOT round up, no, it should be either a d8 & d10 averaged, or a d8. That's a ferocious HD for a caster!
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I would argue that it would be easier in play to assume that every HD type above a d8 adds 1 pt/die rolled, while a d6 subtracts 1 pt/die rolled (min. 1/die).
So looking at CMW & single-classed recipients, to keep it easy, it's 2d8 + CL + HD mod. The HD mod is -2 (min. 2) for a d6 full caster, 0 for a d8 partial caster, 2 for a typical martial, and 4 for a barb/DD. What this means for multi-classed characters, I leave to you. But obviously, again, players have to record their "HD mod" or whatever you decide to call it on their character sheets.
I'd go with something simpler, like give characters with d10 and d12 HD a bonus to healing received. Changing dice for each healing seems like unnecessary pain in the... injury. Not to mention it will mess mass cure wounds spells.
I read about a system like this is a book someone wrote, which was essentially a rewrite of oldschool basic D&D. Its very simple for single class characters or for those with a single type of hit die. So barbarians benefit the most, while wizards suffer a little. I love the intent of it and think it would be a great addition because it helps high-HP damage sponges. However, things like channel energy, multiclassing, and mass cure spells complicate it to the point that I don't want to mess with it. But I have though about it quite a bit. The thing I came up with to simplify it as much as possible is that you use the hit die that the majority of your hit dice are. If you are 4d8 and 4d10, you would use d8s. If you gains one more d10 then your healing jumps up to d10. Obviously there could be additonal considerations if you have three types of hit dice or if your hit dice are d8 and d12.
Maybe use the hit die of your favored class?
I'd go with: recipient of magical healing gains +1 bonus to healing received for each d10 and/or d12 HD he has... So a fighter 10 will get +10 to healing received, barbarian 12 will get +12, a fighter 5/barbarian 3 will get +8, and a fighter 5/wizard 5 will get +5.