I've got a Dell mouse that does exactly the same, switches are getting worn. As you say, the double click setting doesn't change it which is weird - and bloomin' annoying.
A rapid large number (30+) of HEAVY presses puts it right for a week or two.
What also helps is using the mouse right at the front of the switch instead of pressing it in the middle.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates