I have that tendency as well, and I think many do. What’s great is that you have that awareness! That is the key to your success.
You might want to try watching your volume closely and focusing on using passively released air, not active air. That helped me better isolate Shape from Air and prevent me from using more air to achieve the speed and instead focus my attention on Shape. Are you increasing the volume (dynamics) as you go faster?
Your throat is probably coming into play because you are using more Air as you start trying to go faster–that’s what needs to be avoided.
My $.02 FWIW. Hope that helps you.