falcon
Normally the SST's come with an HPH-12 sabot but there are rumors that the NEW packages of them come with HPH-24's - I have not confirmed that with Del yet. So, normally I would say if you are shooting SST's then the next sabot down is either the Harvester regular short or long black, or the HPH-24 - dropping to the "low drag", the "Easy Glide", the 3p-Ez load. or the "crush rib" will probably cause a bit of loss of accuracy, actually pressure also.
Confirm something for if you would, are the red "low drags" a 3 or 4 petal sabot? I am operating under the assumption that they are a 3 petal sabot. + they should have stair stepped powder cup - or are they a smooth cup.
So if I were moving from a SST sabot I would go to a MMP HPH-24 and try that - it should load easier than the 12 and accuracy should really remain close.
Just my observation... (actually I am surprised you can get a HPH-12 SST sabot down the barrel of your Encore at all)