runecaster… only isa has real synergy for you, and the downtime is huge. it seems better to party with a runecaster than to be one with your build. runecaster would be slightly better if you decided to get lots of CON with giant rune. SPR is always a mistake with %sp cost skills.
cryo2 is terrible- gust only needs lvl1 and only really benefits you if you use with icewall. but you want to use kino with icewall instead. and subzero shield gets exponentially better at cryo3. if you want kino with 2 ranks, you’d be better off with pyro1 linker1 kino1. psychic pressure works with linked fireballs and becomes amazing.
to hit 16 icewalls you are gonna need kino2, or 7 aoe ratio from somewhere… amazing equipment, or 5 from sorcerer familiar . sorcerer also gets alot of sp regen that you might want. so its either kino2? sorc1? or some amazing gear. kino2/3 is the most popular choice for the rarer skills, and kino2 gets PP stun attribute.