just started playing max hit points each level to differentiate the fighters/barbarians etc from the wizardy types.
average rounded up give a sorceror type 3 each level but a fighter only 6 each level - a difference of only 3 whereas max per dice gives a difference of 6.
Of course, the baddies also get more hit points - I usually give peions 2/3 of max and any specific NPC will also get max.
this seems to be working pretty well