Jedi used to road ride, he might be able to help? Give it time…I was rubbish descending for a good few years, it’s only after a lot of practise, pushing myself out of my comfort zone and new brakes that I can descend with ease now. I have even gone as far as perfecting my tuck to help my racing, something I never thought id do!
Otherwise, brake well ahead of when you need to, stay relaxed and look at your exit. Dont think about the skinny tyres, not had an issue (in all weathers) with that. I know where you are coming from with the wind – I’ve learnt that being on the drops and pedalling helps keep the bike stable so you could maybe try that?