Using 60 degrees is absolutely pointless. Tell me ANY time where that measurement actually matters to the printer.
The only time it hits 60 degrees is at top, in the resting position. It has no bearing on how wide or tall you can print (other than getting in your way). It's a static measurement on a measurement that matters only when moving.
Make sure your rods can reach the edge of your build surface and ignore the angle. If you need more height, add more to your vertical rails. Taking it out of your diagonals is just silly.
As for how much extra, Cyan should be fine.
The only time it hits 60 degrees is at top, in the resting position. It has no bearing on how wide or tall you can print (other than getting in your way). It's a static measurement on a measurement that matters only when moving.
Make sure your rods can reach the edge of your build surface and ignore the angle. If you need more height, add more to your vertical rails. Taking it out of your diagonals is just silly.
As for how much extra, Cyan should be fine.