I got the micro-x pressureless balls and found them to be as hard as rocks. They might be ok at lower speeds, i.e. slow ball machine feed or 3.0 and below rallies. But at higher speeds, I could really feel them. I would try out a can first to see if you're ok with the hardness.
Head Youtek Graphene Speed Pro | Babolat Tonic+ 16 @58 lbs