Homun and Party Shared EXP?

[The Legendary Joe]

While it isn't in party,I still have a question about Hom exp. When I hit the same target my hom is hitting, or has hit, it seems like I get less EXP then if I let the little bugger solo it. Why is this?

Like against muka, I want to get some of my job exp back from the consecutive kills over and over and over but when I stab it, I get 203 base exp, 404 base exp, 281 base Exp, regardless on wether or not I did the most damage, whereas I get the full 1.3k from letting it kill it with me playing support (which it doesn't really need on such an easy opponent)