Zeagle makes an 85 for their Ranger, I believe. It is sold separately.
[Edit: an 85 means it has 85 lbs of lift capacity; this is the largest wing I have ever seen.]
If you don't mind going the BPW route, and you know someone who can tech you how to rig it, then that would be your best bet. Deep Sea Supply offers variable sized and variable weight plates. This would take some of the weight off your belt and put it onto your plate, which is better for your back.
Your wing only needs to be large enough to float your rig separately in the water. And by switching to aluminum, you lower this weight requirement. The rest of your weighting you can wear on your belt.
You should be neutrally buoyant at the end of your dive, when your tanks are down to 500 psi. Thus you should adjust your weighting to achieve this. Plan to exhale deeply, when you start to descend, rather than weight yourself overly negative.
You also may want to consider a drysuit instead of a thick wetsuit, if you are diving in cold waters.