I hate to break it to you, but it's a fact... you are only getting 0.1mg/mL at 5 pH, and only 0.04mg / mL at 7 pH. I'm not lying, I have no reason to lie. You are wasting alprazolam without diluting it thoroughly enough.
IV alprazolam and IV midazolam are very comparable, with the exception that midazolam is obviously preferable.
What college did you go to Mr. know it all? Obviously, you're wrong. You may have felt FULL effects, that's because you weren't eating the alprazolam, you were IVing it, and only getting but so much in your 1cc.
Even at 7pH ; midazolam is poorly water soluble. Look it up! I'm not lying, I have no reason to lie here.
The only reason you SAY you felt "full effects" is because when you eat a drug, it takes forever to onset. With IV, it's an INSTANTANEOUS onset. The difference between oral and IV dosages can be outrageous. I would eat 0.5mg of alprazolam, or IV about 50 micrograms. I could sublingual 2mg of Suboxone, or IM about 0.1mg. Think about it. You felt "full effects" because you got like 0.1mg alprazolam, not 1mg of alprazolam.
1mg of alrpazolam IV would put you out really quick, unless you had a retarded benzo tolerance. I have passed out from 0.1mg of alprazolam IV without a tolerance. It's very sedating. My girl only uses 0.3mg to get off, and she has a tolerance. She still gets high/passes out - but she needs a 3cc barrel. You can't just will science away man. Science (and drug solubility in a solvent) is a very real thing, just as real as the drugs you are IVing.
But by all means, don't use a micron filter, use tap water, and don't even bother cotton filtering. Why am I here telling you otherwise, right? I'm just trying to save everyone a lot of pain and suffering from missed shots, wasted drugs, etc. - I hate to think about how much alprazolam gets wasted from people trying to IV it!
When I micron filter Xanax and don't use enough water, the alprazolam is STILL IN the filter. I can do a wash past a used filter if I didn't dilute it right, whatever comes out will still have 0.1mg/mL in it, as I use 5 pH bacteriostatic water.
I had to get my girl to believe this too (she used to use 6 mg per 30mL but I convinced her that the maximum solubility IS 3mg per 30mL and she's happy only using 0.3mg in 3mL).