I have 30k health and 28k shields with the regen shield in combat attributes on my Ajax, he is badass right now and still have like 7 spots to upgrade with the the crystalization Catalys. I am going for ulitmate Ajax 1 piece away but have to rebuild it so I hope it's worth it in the end!!
Always room for improvement, I have a similar build. Commenting on the Defence part, the diminishing returns for high to very high defence goes like this. At 30k it's 53% effective, At 40k it's 57%, At 50k it's 59%, At 60k it's 62%, At 70k it's 63%, At 80k it's 65%, At 90k it's 66%, At 100k it's 67%. So best for value is around 60K. Build however you want the diminishing returns is for those that don't want to push the limits. BTW I'm at approx 130k defence.
@raymondlyle3859 I solo all hard mode content with thud build and as I mentioned this is the best build for solo and team play because of the utility provided by the matrix recomputation mod