Which rings should I be wearing?

Best ring set up (requires meister shoulder instead of Black tinkerer) now should be
- Superior gollux
- Reinforced Gollux
- Meister Ring
- Scarlet Ring

To activate Meister set effect instead of Reinforce set you have to :
It wil go to which ever set effect you have equipped 1st. Ex: Un-equip everything and leave Reinf, equip ring= becomes gollux set. Ex2: Unequip everything and leave meister, equip ring= becomes meister set. Credits to Genostigma from Basilmarket

With the Meister shoulder you'll get the 40 attack set effect which might overrule black tinkerer since the Meister shoulder also has more enhance possibilities compared to the lvl 100 tinkerer.