I have 1000 SS vs 900 Crit. I DPS a lot in raids and trials, but one thing you gotta remember that Crit gives you is crits on Embrace and Whispering Dawn, which can help both you and your co-healer a lot. Tbh that's the main reason I decided to stick to a high Crit, since Eos critting constantly saves a lot of healing. I'd say that the crit shields are at the bottom of my priority list when it comes to substats. The second reason for a high Crit for me is Lustrate, which will usually top off a DPS with a single cast if they took damage that has to be healed through in an emergency. It might be a "me" thing, but my Lustrates seem to Crit like 90% of the time, hahaha.

And of course, DPSing is also greatly affected by Crit, so I would recommend having a relative balance of the two.