Matthew Spears
Registered
I dive sidemount using AL80s in both a Hollis SMS75 and SMS100. I don't use weights on the tanks. I use fixed D rings on the waist straps instead of the rails for my tanks. I tried using the rails/doorknobs with AL80s at the start of the dive (then move them to the D rings as they become more buoyant), but found it impossible to achieve proper trim, so I start with the tanks on the D rings. Most will say the rails are for steel tanks and I agree, at least for me. I believe there are a few threads here arguing for and against weights on the tanks. Although you will find a vast majority against the practice, and doesn't appear to be the best solution, some have their reasons to do it, and it seems to work for them...
How did you set up the D rings on your sms 100? I just bought one and based on how the waist strap comes around I'd imagine that clipping tanks off there would almost cause them to move to front-mounted tanks.