I experienced wobbles recently on my 2019 Specialized Venge Pro. Had the bike for a couple months and had no issues. Plenty of decents over 40mph. All of a sudden, little gust of wind off a passing dump truck while going about 35 and I’m changing my bibs. Happened 2 more times on windy decents over 30mph.
I thought about what i changed on the bike recently. The only change was new tires, bargain GP 4000 28s from Amazon (karma right) with old latex tubes. Ditched those and put on 25mil Vittoria Pro set up tubeless. I also decided to swap out the 100 mil stem to a 120 mil stem. This matched my old Tarmac geometry better and during my bike fit my LBS recommend a longer stem. The bike feels less twitchy now.
Since then I have been easing into it and upping the speed. I had a breakthrough the other day following some teammates downhill and am getting some confidence back. I do want to try a lower profile rim to totally knock out the fear.
Thanks for asking the question RJ and the thoughtful responses from everyone and links from Chad. This forum is awesome!