No hot water in faucet where return line for recirculating pump is installed
"A trickle of hot with the cold turned off" is utterly normal for any modern fixture with a built-in anti-scald valve arrangement, which responds to low cold water pressure by blocking hot water flow.

If cold water is flowing from the faucet to the hot water circulating loop, it sounds like you need a check valve, or if you have one it's backwards, in the wrong location, or not working.