For power, it is the weight and speed that does it.
Low reps with maximum weight for strength, slow movements
Lots of reps with low weights for endurance, even speed
For power - highish weights at least 20 reps, then repeat until for at least 3 cycles, then do another muscle group. Each rep to be done as fast as possible, no rests between reps.
I used to do a lot of this when kayak training (my power was a bit pathetic). So my max lat pulldown was about 90kg - for power training I'd use 70-75 kg.
You have a hip injury, it ain't going to ever get better (I can sympathize, I have a damaged hip from a childhood disease, I can't do jumping either). I think you need either a weights bench or weights machine. If you have room at home, wait until about 3-6 weeks after xmas, then look for the 2nd hand, used once ones.