First, get the fuck away from those full ring PLO tables. Full ring PLO is probably the single most boring game ever imagined. Play 6 max.
Second, pretty much none of the hands you're showing here should even be played, they're folds preflop, especially in full ring games.
Third, yes, two cards, not that you "can only" use two cards, it's that "you must" use two cards. You cannot use 3, and you cannot use 1.
Fourth, yes, it's boss over boss every single time, especially at full ring nano stakes PLO, the absolute stone nuts are going to be necessary to win 90% of the pots. Play hands that make the nuts, not these garbage 3rd and 4th nut making hands that you're showing here. Making 2 pair, and then putting money in the pot is usually going to be just burning money for you.
Play aggressively postflop...
...with 10+ high sets (on non straight/non flush boards)
...with big flush draws like nut flush draw + pair or two pair, or nut flush draw + pair + gutshot to a nut straight
...with nut straight wraps + any flush draw or any pair+.
Play pretty much nothing else postflop until you're much more comfortable. It's $2PLO, it's just like $2NL, they aren't folding anything, you have to make nut hands and value bet them to death. So just like when you were first learning to win NLHE, you're going to have to play very tight, never bluff, and bet very big when you make nut hands - there's probably no reason for you to ever bet anything other than full pot.