I have a leak in the left storage well, only after it rains not when washing car. Had good advice on here and seems to be the same as you have. But didn’t have time to take it all apart so I have used gorilla tape over all the gaps and screws on the left hand side to see what happens. Not had any rain for 2 weeks so don’t know.
If it still comes in it will be from somewhere else.
but surely it can't be that different can it?