Sorry I was doing calculations at 2 seconds timeout.

Lets make it even harder for the TCP truthers. Hold on to your neckbeards.

Lets say that somehow sending 90 byte packets 60-times a second for 2 seconds is bad. Lets also say it would be nicer to have a longer timeout like 10 seconds. I agree.

Here's how to do it. Clamp the maximum number of inputs per-packet to 60 (1 seconds worth). If you don't receive any acks for one second something is clearly wrong. If this happens go into "congested mode". In this mode, send packets only 4 times per-second, and keep resending those 60 inputs until an ack comes back. If no ack comes back within 10 seconds, time out. If an ack comes back, go back to non-congested mode and resume sending at 60 packets per-second.

There you go. Congestion avoidance over UDP. Problem solved.