k-def maybe N too.
Removing all those leaves almost certainly exacerbated the underlying problem, too. Plus, all those gaps in canopy -- the majority of area is empty space -- is a giant waste of electricity with all those photons missing the tops of leaves.
Mirriors are also nota great idea. Can cause hot spots. A surface that diffuses (vocab may be wrong, lol) light is best. this is why a flat, matte paint is better than a glossy paint or why stamped mylar is better than unstamped mylar. Poly film (aka panda film) is also a good, cheap option.
White matte paint (highest RGB hex you can find on paint can, closer to ff:ff:ff the better), stamped mylar, panda film, orca film are all great options. I wouldn't split hairs between which you use... e.g. i doubt the orca stuff is worth the cost.