I'd run a thicker cable to what you guys call a terminal block, can't remember it as it's alien to me (wago?)... I'd suggest 2.5mm^2, again I'm not sure of that in AWG... But given the right cable that's good for 32A, insulation dependent!
Then from the block use thinner cable to each bank of LEDs & resistors... Each cable run should need no more than 0.5mm^2 which is good for 6A...
It'll reduce the losses