RE: Hypersonic 133 DRAM vs formula
Hard to answer your question but maybe my experience mighty be usefull. I think it will depend a lot on how much you weight.
I own a HS133 which I use mainly with Severne OD 8.5 on flattish fresh water lake.
At 66Kg I can plane almost at the same time as the bigger guys ,say 80+ Kg on FW and 11 m sails. Once on a plane they?re a bit faster in lower winds though.
I?m not sure if I can answer your 2nd question.