I think the lube makes a huge difference. I tried to use stock mx blue springs with clear stems on my filco without lube in order to wear down the stems for maximum smoothness--and the thing was not even usable! Almost every switch stuck.
The source and condition of the clear stems used is an notable factor in whether an ergo clear sticks when lubed. Having gotten clears switches from different sources, namely an old g80-8113 (well used), clears that came with my ergodox, and switches I purchased elsewhere, I found none of the switches from the 8113 to stick with stock mx red springs, even when unlubed.
The brand new clears on the other hand, had 1-2 stuck switches when lubed and using 62g springs.
The older clears are now in my daily board with 55g korean springs lubed with krytox and none of them stick. In fact, they feel smoother than the 62g switches which I haven't used enough to wear down.
That said, all variants of ergo-clears should always be lubed imo.