With only 4, you'll get +3. Really depends on how many you usually get and how much you're willing to invest into him. If you want to +10 him as a 5*, then I'd start doing so now. If you just want to use him as an additional unit that isn't apart of your Arena team, I'd just stick with +10ing him as a 4*. You say you're in no rush, so I'd suggest sticking with 4* Boey for now.
CC is definitely the way to go with Boey since his defenses. I have never used him myself, so I can't say for sure on what's better than what, but I'd imagine sticking with his strong suit, which is defense.
Side Note: While you have merged a bunch of your units, they aren't bad by any means. A 4* +10 with their 5* weapon is considered half a merge less than 5* +5 (According to how the Arena's score is based around), but has the exact same stats. Those units will come in handy when they show up as bonus characters.
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