I kind of skimmed here, so it has probably been said, but here goes.
First of all, you will not get 7 30s into a 1cc rig, would have to be 3cc minimum. Although that would work, its not a great idea to cross the line into IV.
Someone mentioned H, which is a good idea considering your habit, but I won't condone that as its a bad idea to cross that line too. I am guessing maybe this is your personal script and that is why you are able to even afford a habit like that? And what about snorting? You mention that oral is ineffective, maybe snorting it will give you some sort of rush that your after, at least a tiny bit as opposed to hitting the needle.
If you are going to IV, I won't judge as people do what they will regardless. Apart from the amount, etc, please be well researched on the actual process of shooting up, given it is your first time (think I read that correctly?) It is not exactly easy if you don't know what your doing; all depends on your veins, your steady hands, etc. Definitely be safe as far as sanitation when going through the process.. use filters.. alcohol swab on injection site (AND LET IT DRY) before injecting.
Not to sound lame, but with that kind of habit you may look into methadone or suboxone treatment, unless it is a personal script that you are able to continue, though that is quite a dose to be using daily.