The Power Ring Sizer has to stroke ALMOST fully to the baseplate of the press, it has to go to the hull rim, so, from the sound of it, yours is likely adjusted too high.
Measure, check, and adjust (loosen lockring, screw sizer ring down a bit, re-lock, retest), lather, rinse, repeat as necessary.
Not all load recipes fit correctly, I know I know, the world shouldn't work that way, but it does.
A dished crimp is because the Stack Height is too short.
You have too little powder, to little shot, or too short a wad.
The fix is either more, or more, or longer.
You don't really want to go with "more" of either IF load pressures are already near maximum, if they are not however, there is "cushion" for increased powder charge or increased payload weight to increase pressure.
"Adding more" is only a cure for SMALL dishes, if it dishes really deeply, the wad is the basic problem, and needs changed.
Not all powders are the same density (weight per volume), ball powders tend to be very heavy in small piles, extruded flakes such as Blue tend to be very fluffy, an appropriate charge of dense ball powder that doesn't fit (stack height issues) CAN in some cases be fixed by changing to a fluffier (less dense) powder, again, at an appropriate charge level.
Loads that fit a cheddite hull are going to likely fit exactly the same in a Fiocci hull, they are made the same with the same internal volume.
They MIGHT fit that Estate hull, it depends on how thick the basewad is (internal volume again), I am not familiar enough with the construction of a Winchester 28ga hull to say much as to whether or not it will fit there, again, basewad height/internal case volume is what matters.
"Hull Identification" is the #1 importance in shotshell loading, but that ID has absolutely NOTHING to do with Ink on the outside of the case or the color of plastic (or brass/metal head height). It has entirely to do with the internal construction and thus internal volume of the hull, as to whether or not a certain stack of components will fit or not.
Also, those Cheddite hulls are going to require Euro-primners, tehyua re very slightly larger in diameter than "domestic" #209 size shotshell primers, so, you are either going to have to keep 2 sizes of primers straight (Winchesters and maybe Federal Estates vs. Fiocci/Cheddites) or isolate yourself to the European primers and force them into the domestic hulls (doesn't "hurt" them, but you can't use Domestic primers ever again, loose, they will fall out).