Not really, durability and PL are pretty well tied up. Baring gags of course, gags > pl. Dolor and gloxinia should have had a boost at that point too though, they also had POD at that point. I really don't see how dolor was not using all the power he could muster at that point. Had he been at less than half his known PL then meliodas wouldn't even have need an opening, he could have sneezed at him and defeated him.
How are durability and PL tied up? Do you mean that you become more durable as you power up or that PL= Durability? Because if it's the latter I disagree.
One thing is sure, Dolor didn't dance when he fought him. And Meliodas didn't give him the occasion to.
As for durability, generally Mages are inferior compared to the others. And after that it is a matter of race. From everything we have seen I would say that:
Giants> Demons/Goddesses> Humans> Fairies. It's a general assessment.
With Heavy Metal Giants can have an even better defense, but they lack regenerative abilities. In practice, High Class Demons/Angels's are better because of that.