Carby Mitts is mainly for soloing bombs, you don't really need it otherwise.
Bombs "can" be good exp, but its so random, boring and doesn't cap your summoning skills.
You can try soloing Bst pets, or even Chigoes at the appropiate lvl. Use Shiva, Double Slap > Sleepga, rest repeat. If you don't have Shiva yet, with enough mp gear you can just let avatar melee and tank will BP timer up.
At lvl 50 you can try Gustav Tunnel for leech pets.
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