It can get complicated.
Depending on where the soreness is, you might not need a suspension stem, especially since you have a front fork (haven't seen a lot of reports on the two working together or not)
I'm not selling SQL stuff here, just scroll down for examples of what changes can be made to alleviate different specific pains.
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One thing that made a difference for me was rotating the winged Ergon grips (grips similar to yours) so that the palm rest was pointing up slightly, which kept my hand more in line with the forearm.
I also changed out my handlebars to bars with a 16 degree back sweep, which also helped a lot/
PS: I do have the Redshift 30 degree stem and it's great, but I ride a rigid fork. YMMV