Spent yesterday officiating at the RG65/DF65 Travellers Series 6 races at the lovely Furzton Lake , Milton Keynes. Field of 21 sailors, 4 of them being DF65's. Brings home to you just how much faster the "proper" RG65 designs are over the DF's and I would assume the Affinity. That said, the DF's sailed well and enjoyed racing against each other but the carbon fibre skinny design RG's with swing rigs do sail so fast.
Interestingly, one lady skipper sailing her DF was struggling a bit as she hadn't experienced similar conditions before, until one of my club members (also officiating) suggested that she change down to a B suit, when the boat sailed much smoother. Although it wasn't overpowered in the A suit, it just seemed much nicer to sail and she seemed much happier