I'd say go for Momo first, as she puts out a good dmg outtage and as a support she is not so easy to kill lvls 50-70. Then go for renji that will replace yumichika. After you get him i suggest investing quite alot into spirit stones armor etc as he will boost you up alot! Overall 1-3-1 formation is not so great lvls 50-70 as ppl then get the attack assauterrs spells and you can lose your dmg outtage in the 2nd round which could be described as 70-80% lossing of your pvps.
NOTE do not recruit Рenji before Momo ! Before he has items etc he is quite weak unlike Momo who can be useful even at low power due to her stun and as you are a kido main you will be able to put a good set on her in no time!