A question on Biscuit

Hey all, I got a Biscuit yesterday after trying for two days on different sizes.
Settled on a 5'10" as a 6'0" was too floaty and couldn't duck dive, and the 5'8" was about same as 5'10" to duck dive (I think the width on those two were less, I think 6 was 21 1/2 and 5 8/10 was 20)
Anyway, my question is what waves can these board handle up to?
I heard slater went on 6-8 ft pipe with one of these, but I'm wondering what an average type surfer would be able to do
It handles ankle tappers not too bad, but needs the write one to get it going... so nothing like a fish I once tried, even turns need a bit more power from the wave to really shine.
Anyway, I have a good few beaches I would like to try my new lover with
and one of them gets maybe 8-9 ft, and before I got there, want to make sure my board can actually handle it haha
It is a 5'10" x 20" x 2 5/8" board with pintail.
I just want to know what this board is capable of
it's awesome from the few days I've tried it already! Even the 5'8" caught the ankle tappers like a charm, but needed much more power to get going... Hell I could have gone to a 5'6" maybe 5'4" with how these boards are... Just the conditions and places I surf are so varied I need something from ankle tappers to 8ft or so...
And the guy I bought from couldn't give me a 100% answer but, it's a thruster setup, and I know it was designed for thruster, but on smaller waves like 2-3ft what about removing the middle fin, and changing out the 2 side fins for twin board fins? Would that maybe be better?
Settled on a 5'10" as a 6'0" was too floaty and couldn't duck dive, and the 5'8" was about same as 5'10" to duck dive (I think the width on those two were less, I think 6 was 21 1/2 and 5 8/10 was 20)
Anyway, my question is what waves can these board handle up to?
I heard slater went on 6-8 ft pipe with one of these, but I'm wondering what an average type surfer would be able to do

It handles ankle tappers not too bad, but needs the write one to get it going... so nothing like a fish I once tried, even turns need a bit more power from the wave to really shine.
Anyway, I have a good few beaches I would like to try my new lover with

It is a 5'10" x 20" x 2 5/8" board with pintail.
I just want to know what this board is capable of

And the guy I bought from couldn't give me a 100% answer but, it's a thruster setup, and I know it was designed for thruster, but on smaller waves like 2-3ft what about removing the middle fin, and changing out the 2 side fins for twin board fins? Would that maybe be better?