Hi and welcome!
I have a few questions but hopefully we can help! Which formula is he on now? How are the nappies? Have you had a follow up for the tongue tie - sometimes they can reattach which could be the case of the clicking. If it is the tie that could be making him more windy.
What flow teat are you using - using one too slow or too fast can also make them take in too much air. If it's too slow they get tired and only take enough milk to take the edge off, but not a proper feed as it's too hard work.
Another thing to think about for a poor feeder with the wind is reflux - has that ever been explored. It can be a symptom of milk protein intolerance, so if you are using a partially broken down formula it may be that.
My first refluxer was a nightmare to wind and if we stopped him mid bottle he would refuse any more. In the end I just let him feed as long as he wanted and then burped after. I did have to sit very still with him for a while after a feed or we both ended up wearing it

Laura