On the U.S boards they say you should slot 3 def 3 heal cause the heals enhance your max hit points and turn you into more than a tank 
Personaly I would go 2 rchg 2 def 2 heal or 3 rchg 3 heal or somthing or nuffin
Hmm... You cant slot heal on kuji in retsu :S
- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein
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Hmm... You cant slot heal on kuji in retsu :S
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Yep... That leaves a most obvious choice of 3x defense and 3x recharge.
^ Is exactly what I went for...Considering it also Buffs, Speed and Jump, I'm surprised it didn't have those either, but I wouldn't have went for those anyway, defense takes Priority in the situations you'll be using Retsu in.
That is of course if you get hit.
3 recharge or 3 recharge and 3 def?
- @DSorrow - alts on Union and Freedom mostly -
Currently playing as Castigation on Freedom
My Katana/Inv Guide
Anyone who doesn't take truth seriously in small matters cannot be trusted in large ones either. -Einstein