1. What you really need to do is get rid of your med patients. They're a time suck and only translate into intermittent procedures for the visits they take. I would recommend getting an NP/PA to see your med patients and routine follow ups so you can see more new patients and more procedure heavy patients.
2. You can order more than one procedure on an office visit (assuming the insurance allows.). For example, I may schedule a TFESI for radicular pain, then a lower facet injection for axial pain 2 weeks later, then maybe an upper facet or repeat lower facet/SIJ or something. Yes, only if indicated. I always tell them they can cancel their later procedures and schedule an office visit instead if they're feeling better, but this way we can avoid the hassle of bringing them into the office unnecessary and wasting money in between procedures.
3. PCP referrals usually are worth less procedure-wise than surgical referrals, even if you pre-screen them. Schmooze the surgeons in town, spine surgeons in particular, and focus on getting their patients in ASAP. They appreciate quick turnaround and that you don't bounce back the crazy non-surgical ones. See if they're interested in doing SCS implants or if you can grease the wheels for them in other ways. Diagnostic SIJ, etc.
4. I disagree with Ducttape, doing mostly injections doesn't necessarily make you a "needle jockey". You provide a service not everyone can do, it makes sense to maximize your referrals to be for the procedures you can do others can't.
5. I would NOT try to increase revenue with Trigger points, Joints, or other sports injections. They all pay crappy and aren't worth your time (unless you're doing PPP/PRP/etc).