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I'm no expert and you should probably talk with a professional. But, ulnar nerve flossing could help, you could google some exercises. I suppose it might also be your neck instead of you hands that's causing the problems, nerves pinching somewhere further. And with aerobars I feel it's important to have extensions that put you wrists in a neutral position, which many of the straighter extensions don't really do, I'd say it's better to have a proper bend in them. And on the MTB I like the inner barends for a slightly different position that's still good enough for some of the terrain and keeps your fingers on the brake levers.
Samuli-
oh thanks, will look into the flossing. My aerobars are the profile design ones that bend up, and I have extenders under them to lift them up – super comfortable and I don't think they're making the issue worse, just any time in the hoods is. Had my eye on some of those SQ lab inner bar ends, maybe worth a go.
cg
yeh I had aerobars and used them a lot in this last race – they definitely helped general comfort and provided relief in my hands but unfortunately didn't mitigate the problem. I also had them on my MTB earlier in the year for an offroad race but barely used them as the terrain just didn't suit them