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

[Scubasasquatch]

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!

 

[scubaNYC16]

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?

 

[Scubasasquatch]

Do they have enough 117 tanks for everyone or need to request them in advance?

I don't think so. I requested mine. There were 100s, 117s, and 120s on board all my dives

 

[scubadada]

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.