Also you need more stages of PRTI and PRTO. This will allow you to stack PHOT pixels on top of each other. Also, you shouldn't use red filter for hot lasers. When hot laser melts metal or brick it makes lava, which is red orange. The lava will scatter a red beam with much of its heat. Blue will be absorbed making it much faster..
That's a lot of lasers. However, much of the phot being generated isn't doing anything. I put in another 25 block of PRTO without causing degradation of the beam.