BGN,
Timing, and weather can really affect rooting. The cuttings I took in early summer exploded.
But I'm pretty sure you mean winter cuttings. I have rooted about 40 varieties, so not an expert for sure, but with that said, the fastest rooters were Wuhan, and Hollier. Neither seem to show obvious signs of FMV. Days not weeks to see roots. Bottom heat will speed things up.
Fresh looking cuttings usually out perform stored cuttings. And you are correct, IMO, the trees with obvious FMV don't seem to root as easily.