You've done most things correctly in order to correct this. Low p.h is the normal culprit wrt blue cast on Kodak with CR56, the cast will be magenta on fuji film with the same problem. To fix this try a 10% aqueous solution of NaOH to the colour developer.
If you've tried this (and I can see you've used the NaOH) then it could be contamination of the first developer with fixer, or even insufficient agitation (unlikely with Jobo) too little part A in the colour dev will also cause this.
One last long shot is to buy some Fuji controls as well, remember to apply the printed corrections when you compare your strip to the reference after reading on a densitometer, you could just be looking at batch variation if you just compare by eye.
Good luck