HP117s

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If your in the Florida panhandle I can’t imagine that Ed at Cave Adventure can’t get you a set of LP 85’s.
 
@jvogt I only have MI al40's, but compared to my buddy's al40's during a drop drill mine sat flat on the bottom while theirs had floaty butts with 50% nitrox. I don't know if theirs were Luxfers, though.
 
I couldn't find any data on MI 40's.......Here is the data I did find which may allow you to guesstimate.

These numbers are at Zero PSI w/valve in pounds (- Sinks + Floats)
Faber - Steel HP40 Buoyancy -1.48
Luxfer - Alum AL40 Buoyancy +2.33
Worthington Alum AL40 Buoyancy +1.53
Worthington Steel X40 Buoyancy -3.3
Catalina Alum S40 Buoyancy +1

Here is where you may be able to extrapolate some as it appears for the 50's MI is pretty close to Catalina, which may or may not be the same for the 40's for which I could find no data.

Metal Impact Alum S-50/XS-50 Buoyancy +1.4
Catalina Alum S5 Buoyancy +1.2

Faber Steel LP50 Buoyancy -1.5
Worthington Alum AL50 Buoyancy +1.17
 
https://www.shearwater.com/products/peregrine/

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