I have built 200x200 matrices, 480,000 channels. Yours should be no issue. U say u have vertical strips but then say u made a horizontal matrix?? Horizontal matrix mean strips are mounted horizontally. Does each strip start at the bottom? If yes, then model is just 80x30, vert matrix. If you are wrapping in a zig pattern then do 4x600 with 20 strands per string.