Hoya bicknellii rooting
Looks like I'm about to kill my first Hoya and need help saving it. Hoya bicknellii IML 1597, got it from SRQ this summer. Although called by Joni "slow grower", it was growing very fast and drying every other day in it's tiny pot, so I potted it up and it grew foot and a half of vine, but now (over 2 month in new pot) is dying from the roots. Don't know if early cold snap (upper 50 at night) caused root rot, now there is visible shivering of the stem and yellow soft lower leaves. One vine is a bit over foot long and covered with leaves, second vine is over 3 feet long and upper half is bare. I rooted cuttings before, but only 2-3 nodes long, so should I cut these in 5-6 inch long pieces and just throw away (ouch!) that foot and a half of bare stem? Or there is a chance that it will survive/root if I leave 2 nodes with leaves at the lower part? What is optimal length of cutting? I will be rooting it in the aquarium in soil and in turface to increase my odds. I know it's bad time for it, but have no other option!