Steve, very interesting and curious...the wine corks. I can't visualize this but I get the objective. I was thinking that for next year, I'd use sphag. and add chopped tree fern and cc chips...to keep the spagh loose. How does that sound?
BTW, I watered all 3 today and will carefully/patiently wait to water again on the smallest one. I'm going to begin watering heavily the one with lots of new growth and the one with the yellowing leaves, I'll try to fatten up before its winter rest as you suggested. They've been getting lots of air movement and warm temps so hopefully, I'll get them plumped up again and maybe next season....spiking!