Agreed on rubber domes feeling good, I have a GK21s as a numpad alongside my GMMK Pro and I prefer to have T1s in it just to have that snappy collapse feeling. Satisfying on a numpad but too fatiguing for constant typing.
I quite like shorter springs for that reason, the return force can be increased while keeping the actuation and peak tactile force more reasonable. Right now the Durock Medium Tactiles have a pleasant bounce to them on the bottom out since the peak tactile force is lowered a little from the slightly shorter than stock spring. I have some Durock Light Tactiles (which appear to feature the latest JWK molds with the tapered stem rails) which I intend on L+F with 3203, Deskeys and spring swapping to the same 65g 14.5mm SK spring. Not sure which I’d rather use as a daily driver yet but I’m satisfied currently with the Medium Tactiles with the same spring, lube and film combination.
I think you’d like the 14.5mm springs, the product page on Swagkeys.com states:
The length was specifically designed for people who want to add “Great amount” of bouncy feeling to the switches
And in my personal use compared to 15mm TX they do feel more bouncy at the bottom compared to the more “linear” sensation of stock cherry length. Minokeys carries all of the weight varieties SK offers but the weights are only 55g, 58g, and 62g at the low end.