Very gust 5-25 kt NW to SW

Short 'speed' session on my F4 small wing set, thick shim and 5.0 sail.

I had fixed length rope harness lines that I lengthend too late in the session. But then I guess to be honest I wasn't ready to use the harness before then... too scary. 

Ride felt very backfoot heavy under about 22kts then more balanced, which is kind of what I was hoping for. Strugging to understand why it is hard to go past 24 knots.... lot more confidence needed. more ToW!