If getting back into PL'íng, may want to avoid any type of machine work and focus on standard DB & BB work.
Reason being, that with machines your body is given a lot of support/brace work and the important supporting muscles are not called into action that much. With freeweight workout, more of the supporting muscle are called upon, which you are going to need with PL'íng. It's like tuning up the body to handle more serious training down the road. Should also improve the balance and timing.
Going along the line of what WOOO suggest, clean & presses, squat cleans (surprisingly both excellent movements for gearing up for more serious PLíng training). Also DB presses, might try alternating one arm at a time, standing. BB rows or chins (weighted). Taking a break from the over used BP, might suggest doing dips (weighted).
Romanian DL's and GoodMornings also. As with any focused lower back work you may want to included heavier ab exercise (8-12 reps) in the mix. Strong ab's can help in most any form of PLíng. Might find that low back & ab work together can help your squat greatly. Good Luck.
