What size multi channel pan would you recommend for 16 taps in soft maple trees?

I have a 18x34 inch pan (612 sq. in.) which I used on a cinderblock arch. It worked good enough with my 15 taps in 11 hard maple trees, though I ended up boiling every 2 to 3 days after running it through my homemade RO. We have moved to Nebraska and I would like to purchase an arch for the 18x34 pan if anyone makes one.
I came across a 2x3 ft arch and 3 channel pan (864 sq. in.) for $500.00 and was wondering if that might be the way to go, but having and additional 252 sq. in. to fill with sap left me wondering if it might be a hair too big.

Your thoughts are welcome and I thank you for your comments.