Worried about weight & wetsuit choice with Aldora's steel tanks

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Trying to sort through a bit of a conundrum. I'm hoping to make it out to Coz in early or mid June. I have always used Aldora in the past, but here's the problem: I dive a steel backplate, and am worried I will be drastically overweighted with their steel tanks. My past trips have been in the winter and I've worn a 5mm suit (necessary for me on those looooong dives in 79-80 degree water), and did not need any additional lead with their HP120 tanks, and was possibly a tad overweighted in this scenario.

In June I would probably want to wear a 3mm, but without that extra buoyancy of the 5mm suit I'm worried I would be way too negative and diving would be unnecessarily difficult.

So the options are:
  1. Use my BP/W and a 3mm and just deal with being overweighted
  2. Use my BP/W and a 5mm and hope it's not a ridiculous wetsuit choice for June in Cozumel
  3. Rent a BCD to eliminate the issue (downside - I have my trim & accessories totally dialed in with my BPW have not used a traditional BCD since my training 100 dives ago)
What are typical water temps in early and mid June? If I was happy in a 5mm in February, would I be crazy to use it in June?
Surface water temp is 84 now. At depth on most of my dives this past week, it was 80-81. Use the new 117 tanks Aldora has. So, so, so much nicer than diving with a 120. They are a bit fatter, but 5 inches shorter!

Here are the tank specs:
3500ish psi water
HP 120 -8.8 lbs
HP 117 -9.12 lbs

700ish psi in water
HP 120 +0.65 lbs
HP 117 +0.35 lbs

Grab your suit of choice and go dive!
 
Use the new 117 tanks Aldora has. So, so, so much nicer than diving with a 120. They are a bit fatter, but 5 inches shorter!

Do they have enough 117 tanks for everyone or need to request them in advance?
 
My son and I dived HP100s with Aldora. A little shorter than an AL80, same diameter. Plenty of gas for us, used 4 lbs less weight than with an AL80.
 
https://www.shearwater.com/products/swift/

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