^Im with Keif'.
Dude, I totally do understand where you're coming from. Up until recently I was so obsessed with shooting that I would try and slam everything.
I had a script a few years back of the XR's and I tried in vein to get the damn things into a 1mL rig. I remember being left with a syringe filled to the brim with a brightly colored goop, and a spoon on the floor covered in thick, mucous like residue. As horrible as all that was, I still shot it (hadn't even heard of bluelight at the time so though I had a gut feeling that injecting a neon colored solution with the consistency of peanut butter-slight exaggeration, but this shit was thick..then agan, I had used about 100mg for this shot).
The result was an immediate, startling increase in heart rate. There was no real rush so to speak of, like one would get off of cocaine, crystal meth, MDPV or even Methylphenidate.. Just a dirty, scary stimulation that totally negated the whole point of amphetamine's (at least IMO as I like to be productive, and when I did this, I could barely pull myself up off of the bathroom floor.)
I do not want to come off as preachy. I've been in your shoes (at least to some extent) and IV stimulants has always been my true weakness. But the beauty of adderall is that since there's no rush (or, if you've ever shot coke or PV, you'd never consider IV Dextroamphetamine as having a 'rush'), there's no need to shoot it, and since there's no need to shoot it, the urge to redose is not nearly as compulsive as with drugs like cocaine, meth, PV, Mephedrone etc..
(NOTE:This is not meant to suggest that Dextroamphetamine is not addictive, it most definately can be. I'm just speaking from my personal experience with it in relation to my past use of intravenous cocaine/other stims which was a living nightmare)
However, if you are going to shoot adderall XR, you should honest to god get yourself a micron filter. It's not going to give you a pharmacy grade IV amphetamine solution. But it would remove a good majority of the shit that they put in those beads. Honestly, GIVE PLUGGING A CHANCE!! Take it from someone who used to slam Wellbutrin to try and get a "rush" (Yes, I know how stupid that was, but in the depths of addiction, shit can get gnarly, even pointlessly self destructive). Pluggin Adderall/Dextroamphetamine is so much ore rewarding than injecting it. Same ritual, not immediate, but very rapid onset, smooth high, super good absorption (90-99% ), and awsome duration. For me, those pro's are enough to take the sacrifice of inserting an oral syringe into my rectum. I wish I knew about plugging years ago.