Your post suggests that it is a problem with PAT. But it also says that you can ping public addresses in the Internet. If the problem were PAT then I would expect ping to not work. And if ping does work then it suggests that the problem is not with PAT but is with something else.
I notice that on the tunnel interface you have configured this:
ip tcp adjust-mss 1400
but on VLAN 1 and 2 you have configured:
ip tcp adjust-mss 1452
I am not sure why you have done this inconsistently. I would suggest that you make the value on VLAN 1 and 2 lower and see if it helps with your problem.
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