So I've made a slight modification to my MVH studios headstrap. Can't say I've tried it yet, and still waiting on a suitable battery pack, however on a quick wear, it seems to achieve what I wanted. Basically, I've taken the vertical strap off the original strap (just slid it off the horizontal), and using a couple of velcros (the two that the mvh studios came with I believe), connected it lengthwise from the headset to the battery holder, it gives me more front to back security and once a battery is actually in place, it should help the counterbalance have greater effect.
What do you think? I would like to try and find a better way to attach it to the battery holder if possible, suggestions (don't want to do anything destructive, so won't cut and reattach the loop at the rear of the lengthwise strap).