5 stars alone for the fact that I had no 2 off... I do love that level LOL Simmilar to yokosooo, I was stuck at 128, for ''too long''. Only saw the 4 off path, didn't consider (or even notice) other possibilities. :)) I was stuck at 130/128 for some time.
Interesting to figure out how to fill the holes. Has two fairly different solutions (see sspenst's variation level) but it's still a very good puzzle regardless of which solution you wind up using. Left side doesn't really add much, but the pipelining part was alright. 5 stars alone to thank you for the 2 off trick that could be "seen" easily. But maybe my 2 off was not "the" expected 2 off... :D Level was a pain. The final 2 cut is both so simple and so hard to see! 
Insights