What do you mean by 65 up and 65 down? Are you doing 1 inch spacing instead of 2 but offsetting the pixels somehow like sticking the two runs together but offset by an inch? If that makes sense….This year I've got 5,000 5cm 5v seed pixels, made a new star for my tree using MarkM's method (lots of hot glue) and upgrading my tree to 24x130 pixels (65 up 65 down) with power injection at the end so it won't be much bigger but double the density. The star came out great, it's so light but a lot of work!
Just tossing up doing a mega tree with seed or bullets but there aren’t a lot of examples with seed to understand best way of doing so.