Horizontal runs on gravity drains slow water flow pretty significantly. This may not be necessary, but just in case you run into an issue with your drains not being able to handle your pumps output, using a 45 fitting would probably increase your flow. In other words, instead of those two long horizontal runs, you would have downward 45 degree slope to your sump. Of if 45 degrees is too much, you could find a 22.5 degree fitting.
Just a heads up on that rigid insulation: the kind I used had a reflective sheeting on it. I placed it reflective side down (facing water) and it totally dissolved...the reflective material had basically disintegrated and made it's way into the water. I didn't lose any fish but it freaked me out. So now I wrap it in cellophane to avoid tha from happening again.
+1 on what was said about heating the tubing to straighten it out. I placed a roll I got in the sun and it was good to go within a few minutes.
Yeaaahh I was debating the 45 degree angles after all. It doesn't make sense to use a 90 if it's going to reduce my flow. I'm not worried about too much flow with a 45 because my pump is so big anyway. It's going to be scaled like half way back for this operation.
And I bought the kind with the paper wrapping around it so I'll watch out for that. May just go the plastic wrap route off the bat. I had no intentions of it disintegrating lol.
Other than that, does my plumbing look alright? I figured I'd skip a valve on on every return purely for cost. I have the ball valve after my pump, and a valve on the extra arm that goes back to the sump. I figured that'll be enough.

