First off, pics look good, especially your wheels, so props on that
As far as your question, I think 6-8 iu of gh is probably fine, if you stayed at 10iu it wouldn't hurt, just make sure you're running it for extended periods like 6months straight. You might also consider running IGF-1 with your GH, I think this will help a great deal.
All in all though diet is the ticket, I know you already realize that, just reiterating. For me, making sure I get a solid amount of fat in my diet really aids in the bulking process...olive oil, steak, and a shit load of whole eggs every day. Also, I'm sure you're eating several meals per day but if you're not eating every 2 hours this is something you should be doing to obtain the kind of size you're after. So if you're up 16hrs day that comes out to 8meals a day, if that still doesn't cut it set your alarm to wake up at night and down a shake. This is pretty tough to make yourself do, I've done it in the past and it always seems to make a good difference, so you might give it a try.