Each horse is different! I have a very sensitive horse who I flat and jump in a double jointed D ring snaffle. And then a stronger horse who I flat in a double jointed eggbutt snaffle and jump in a rubber straight bar pellham. Test different ones to see what best suits you and your horse. (Tip: Start simple (e.g. sniffles) and work your way up) :)
I have a Selle Francias that is also very sensitive, which bit exactly do you use?
it really depends on your horse, i prefer a lighter one but my horse is very sensitive ( thoroughbred 🙄 (