A combination of heat and moisture seems to give the best rise in my experience - I.e. a damned hot oven and a bowl of water in the bottom to keep is steamy. If bread's deflating when it goes in the oven it means that you've over-proofed it, you want the dough to increase in size by about 1/3 for the final proof, any more and you risk that deflation. Alternatively you could be over-fermenting the dough and leading to the breakdown of gluten, in which case it won't rise well, however you're not really likely to see this unless you've been developing the dough over a long period of time (16+ hours)
Keeping the moisture in is the main reason for the covered CI. (alternative to a water filled bowl)
I guess over proofing is a possibility but it's only rising for a hour.... (after final mix) I'll keep after it... Thanks.
Ken