Patience... I caught 4 tangs with it. Yellow, sailfin, purple, and hippo. The purple was the worst... he saw all the others and was reluctant to go in. He finally succumbed after 24 hrs without feeding and he couldn't resist.
The wrasse, I totally agree, a real pain. The worst was the blennie and the easiest was the hawkfish.
It does work, just takes patience and persistence. I had to go fallow a yr ago and I was able to catch all the fish with it over 2 days.
Oh, for the door to close quicker, just add some weight to it. Works like a charm!
There is a new trap by Nyos that folks swear by... might be worth trying. Haven't tried, so can't comment.
https://www.bulkreefsupply.com/floating-fish-trap-nyos.html