> It has been my understanding that FETs at high voltages (like 24) don't
fully open with 3v3 at the gate,

Do not use the "been understanding" technique if you have a datasheet.


On datasheet
https://www.infineon.com/dgdl/irlr3636pbf.pdf?fileId=3D5546d462533600a40153=
566d1e122698
figs 1 2 3 page 3 tell you all you (probably) want to know about gate
drive.
5 VDC should be "very adequate"


                Russell
--=20
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