@AtomicIsSuperior,
I figured it would be best for ONK to reply to this, as they are his company's boots. I bought new boots last year and tried on the boots you mention, and faced similar decisions (not the exact ones, though). I was deciding between two sizes and between a Redster WC, Ti , and CS. I choose the larger size and the CS boot and I am very happy and the boot skis great in the resort. I do not actively race, but I am a race team coach. I coach in Atomic Hawx Ultra XTD boots (AT touring boots) that have rubber soles, a walk mode cuff, and the new Mimic Liner. I would not race in those (but I do run a few courses in them now and then) but they are so much nicer to stand on the hill in. They work fine for doing drills as well, but for gates they don't have the strength and precision to be serious. I ski everyday in the Redster CS and love it so far. It is so comfortable.
I have a narrow foot, so that is why I was looking at race boots. I would not ski everyday in a boot that was a "race fit" or I was squeezed into, just not worth the discomfort. So your size issue comes down to do your toes touch the end of the boot in the smaller boot, and if so can they stretch it to keep you off the toe box, if not my advice is get the larger size and go narrower if needed (a Ti or WC is narrower than a CS, not by much, but a little). If you are widening the WC to fit your foot, then keep the larger size. I would race in a CS no problem, but if you are really good, I would expect the Ti or WC to perform a bit better at the extreme end of the performance scale. I am not at the upper end of the race scale so the CS would work for beer league racing for me.
Have you tried on the smaller size boot? I did and not only was it too short by a lot, but it was too narrow and crushing my toes. I was told the boot could have been modified to work for me, but why go through that when the larger size is plenty snug and so much more comfortable. If the liner packs out, I will replace with the Atomic Pro liner, as you have done. Just for reference, by shell fit the smaller size was OK, but slightly less than 1 finger "race fit". I guess with the liner in it shoved my foot more forward. I was buckled up tightly so my foot was back as far as it would go. The boot fitter wanted to heat mold the liner to get me back more, but I couldn't take the pain and said don't bother. BTW, if your toes aren't touching in the smaller size, then you should definitely drop down. The main reason to have extra length is for a wide foot to get extra width in a narrow shell without going to a wider model. Fit the "control surfaces" of your foot (ankle, heel, instep, shin) and adjust shell length if needed. (can stretch by 1/2 size if too short).
My suggestions is broaden your thinking on what boot is best for resort skiing and coaching. (Hawx Ultra, XTD, Redster CS, WC, Ti) You also have the option of stiffer flexes for the CS boot if you want to race in it. (that might not be an option that makes sense given your WC boot, unless you want to go smaller size and want the CS to both race and resort ski??)
I think if I was you I would use the WC for racing and get a CS, Ultra or Ultra XTD for resort and coaching, normally your racing boot would be the smaller one for a tighter fit. But if you are a great fit in one size, then both boots should be that size. The concept of going smaller is old school when multiple widths weren't available. Now a days, you can get both narrow and long enough boots with the model width options.