This diver is head down, so I am unclear how a BPW solves that issue? This diver seem to need more weight lower on the body. The canned BPW argument dies not seem to apply, but It's nice to know that your feathers are easily ruffled!
I dive a BPW in cold water with a drysuit. I prefer a Zeagle Stiletto wet and warm.
In the bp/wing, you have the ability to determine how high on the back, or lower down toward the waiste, the backplate is going to sit....this can have a very large effect on head floating up or feet floating up positions...This customization far exceeds any Jacket style BC.
Next, in his next posts, this OP says he is always low on air before others.....he is hoovering....So another fix to his first issue, will also help him in his second issue.....He should be in double al 80"s with maybe a 50 pound wing ( rather than a 40, for his size and newness).....this will have lower center of gravity and be more stable for him....and he will have much more gas.....With his size, the weight in carrying this, should be negligable---maybe easier for him than most carrying a single 80
For this route, he will need help from someone who knows how to rig a doubles setup, and to teach him the basics of using this. He can NOT get into a fundies class, he has a huge amount of work to do prior to this.
I think the ankle weight idea is one of the worst solutions in diving....one almost always easily solved by using the right tank and gear combinations....Some drysuits can not be dived intelligently( ie., need to be tossed out because they are garbage for diving), and there is the technique of using a reverse kick to pull your feet down occasionally, to push let the water pressure push the air out of the feet when too much has begun to accumulate----you never, ever, let this go--you fix it early, with the early signs.
With doubles, there is also the option of V-weights on the backplate -- for a drysuit, if needed.... no need for weight on the waiste....the idea has to be that if a wing failure occured, with drysuit puncture, that he could ditch whatever weight needed to EASILY swim up....so v-weights are only going to be a good option in my way of thinking, to deal with the bouyancy of fat ( which is a constant unchanged by the wing or dry suit failures)...