Oar Length for Hyside max 12

Curious to see folks thoughts on the appropriate oar Length for the Hyside Max 12. NRS oar Length calculation would suggest 8 ft oars, but have seen people saying they run 8.5 oars on their mini max 10.5 foot boats.

I am leaning towards 8.5 foot oars, but am curious to see if anyone has tried up to 9ft oars and has any thoughts.

I am planning to build a 56" wide frame for the boat.