With that roster you're far better off 100%'ing 5.1 and getting those rewards. 5.1 is actually not too hard and can serve as decent training for 5.3, which is a real pain because you need class-specific teams to have a decent advantage in all quests.
The rewards for Act 5.3 completion is to low and a total turn off,I stopped questing after becoming uncollected.I am now 100 percent completing act 5.1.It is not that easy though lots of champs at 15 to 17 k pi.
5.1 first to get more practice in for it. Then work on 5.3, once that is done, 100% 5.2.
I'm doing exactly this because that is where my roster and skill has naturally led me. That'll give you time and rewards to improve your roster for 5.4 as well.
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Will be taking gr to r5 once i get the last t4 mystic and some t4b
I dont have sabertooth