Wow is still in business according to their site- just stretching your machine for you rather than selling stretched machines. I read some blogs and articles about these because I find them fascinating- and 'tinkering' with the machine setup is apparently really common when learning to use them. I saw mention of: lengthening the machine holder, adding more thread guides, various clamps, adding boards under the machine, etc. So I guess you will have to play around. If weight is the only issue, then maybe adding some will help.
sorry this answer isn't more useful....