I don't have a 6mm Creed but your velocity is fairly high for the charge weight used. Please correct me if I'm wrong.
But in this kinda scenario just forget reloading data and go with what your rifle tells you. Reduce and stay withing acceptable pressures.
Too much pressure will always give high ES and SD.
I wonder if H-4831sc might be worth a try for you.
Polish the chamber if you can. I've had a Savage rifle that was over pressure with even FGMM factory ammo (which is not knows for being hot), until I polished the chamber. And I've heard of others solving their pressure issues with chamber polish jobs.
I'm not surprised about the short freebore, but it could be also that the freebore diameter is a little tight.
You can get a thoater from PTG and extend the freebore yourself with out a lathe and without taking the barrel of off the action.
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