reflect shield doesn’t really work when monsters start hitting hard, and subzero shield already provides anti stagger. rune of giants limits a lot of skills that can be used, and rune of protection will almost always be covered by a plague doctor.
cryo3 vs kino3 is really a pvp or pve thing. kino3’s ccs are more reliable because they aren’t status effects like freeze is, and also frost pillar is easy to move out of so isn’t as great as it seems for pvp. cryo3 is really good at mobbing in pve though.
if you are going for a combination of cryo/kino, you should have cryo2 kino1 at least. cryo2 is for 10 ice walls, and kino1 psychic pressure can hit up to 10 with a gem.
are you trying to build for pvp, pve, or both? like you said, rc without wiz3 is really bad, and this is from personal experience too. the most you can do is precast rune of ice, and in dungeons you will never find a good time to rune of destruction. rune of ice isn’t even that great when mobbing because of downtime. i think the only build that can use runecaster well would be wiz3>cryo2>kino>rc for ice wall + pp, and even then, it’s just a bursty build that centers around 1 skill, and not good at sustained dps. (though SS tier for world boss hunting, because most fights will end up lasting less than a minute anyway) the irony about rc is that its best skill and main focus, which is rune of ice, ends up not being that useful for cryo because cryo’s damage skills are limited and they are more for cc/utility. (rc with a chrono3 in your party would be great though~)