My thoughts on a way to properly fix stoneplate without destroying it.

I think it'd be better if stoneplate changed to a 40%/100% current hp shield tbh. Maybe raise it to 50%/125% current hp or 60%/150% current hp to compensate since it isn't direct health.(Reason: Skills will not heal for higher % HP given by current stoneplate too, and the damage will still be heavily reduced thus cho'gath can't abuse it+ulti).

Yes the number will be bigger but I do think it's correct with the reasoning I said. All the stuff that heal based on missing HP/Max hp/cho's ulti will no longer be overinflated due to stoneplate, thus having the amount granted by stoneplate should be a fine. Not to mention it's still scaling off CURRENT health.

This will no longer inflate maokai/darius/volibear/ and few other % max hp healers, still do it's job of using when you've done your rotation and want to heavily bulk up and no longer give cho'gath a boost to his % hp scaling without having to be sejuani'd.