Re: Seeking advice for the severely gravitationally challenged
I've a large friend who's using CrossFit to help with her weight loss. Combined with changed eating habits and additional metcon, she's lost about 55# so far. As with you, she's needing mechanical assist for pullups and dips etc., but the metcon benefits - and weight losses - are coming faster than she'd expected. Makes sense when you think about it - shifting more load = more work. 50 pushups at her current weight are a lot more work than 50 pushups will be when she's lost another 40 pounds.
Watch the activities with high impact though - running has caused problems with one of her heels.