If you haven't yet made the basket here are a few tips.
If the bottom of your basket contains a small step off ridge (Not a perfectly flat bottom) make sure the base of each pylon is completely on a flat surface. Don't let the base of the pylon over hang any of the bottom surface. Fly line will sometimes get caught underneath during a cast. If this happen you can seal the edge with silicone or a quick fix of duck tape.
As far as symmetrical patterns, any will work as long as you spread them out and use all five of them.
Make at least four slot in the back of the basket and weave the belt through them. It will fit closer to your body and there will be less stress on each slot.
The anti-tangle inserts you have are the best inserts I have ever used.