I think you have a different concept of early and late, that's confusing.
Orc's = to what I said,
Elf's = to what I said (except I might point out that you don't have to rush convert just because you benefit from early conversion often),
Dwarf =/= what I said depending on what you think of as late or early. 4-5's mid game, and you most certainly don't want to convert early. lvl 3 conversion takes 3 glyphs to get less than a health pendant, that's terrible. lvl 4 takes 5 conversions for 20 HP. Also terrible, that's all your glyphs. Lvl 5 - go nuts. Before that, no, absolutely not unless highly situational - nothing will happen if you convert something, but converting with the aim to cash in isn't what you're really looking for. You'd have to explore to find so much stuff and then get a semi-meaningless bonus compared to the effort. I don't even want to discuss this, I'll fall into a trap of thinking that if I explain it detailed enough you'll understand, and you won't, I'd be textwalling again and get in trouble for even attempting it. And if I have to say this again I'll get in trouble for not being "nice" to someone else on the internet. So I can't prevent you from doing what you want with it without getting into trouble, so either just back off or wipe it all off. It took ages to convince you goblins made any sense at all, you're the specific reason I didn't post about the update in the first place, and you're so prone to looking at things from your own perspective that it's almost impossible to convince you that someone else doesn't. And it's bloody me telling you that, of all people.
Human: Human takes 200 CP for +1 per level. The rate makes it not worth the rush most of the time, lvl 5's ok, before that it's situational at best. You can do it or not do it, the point is that you don't have to. And it's an important point because humans are the starting race and you very much don't want newbies converting glyphs by default before they get to use them and learn about them, that messess up the learning curve. Especially if you don't have to. Many "how do I even beat a single map" desperate newbie posts boil down to them rushing conversion, you get them to use the glyphs instead and figure them out - it sorts itself out. There are very good reasons I lined it up the way I did, for the love of jesus don't make me regret actually putting something on the wiki finally.
Gnome: same as what I said.
Halfling: same as what I said - you can hold off or not, it's all about what you want to do. And you don't need specific builds, because there's a load of ways to boost the effects of your hit compared to boosting the effect of the fireball (popping a potion for a fireball compared to popping one for a fine sword + knockback + might from boon? Big difference, and that's not even getting into actual builds)
Goblin: timing varies, same as what I said.
Anyway, those are general guidelines, not somethign you have to stick to like the world will end if you don't. I went and also wrote that.