Morning Dave,
i asked this same question in the Electrics section a few months back:
http://www.oople.com/forums/showthre...e+saddle+packs
and one user basically said I was stupid and dangerous to be around.... *sigh* amazing how fearful some people can be of things they dont understand!
It is completely possible, however, I believe (like I did) you have got your balance lead slightly wrong. As it is at the moment, I believe it will only balance each SET of saddles, and not all 4 together.
A true 4s balance lead needs linked to each individual cell (the ground wire just needs grounded once, not twice as you have it)
Heres a great website that explains it all fully:
http://www.commonsenserc.com/page.ph...po_wiring.html
Hope it helps