+1 to carb and serve all on nitro. You need about half the volume of CO2 to get that smooth, silky head. If you nitro pour on too carbed a beer, you get that full head of big, gnarly bubbles instead.
So instead of using 13 psi of CO2, use 25-30 psi of Nitro blend (25% CO2). That put a partial pressure of 6-7 psi CO2 headspace, and thus half the volume of CO2. This method does take longer, but if youre in no rush, leave it on nitro gas a couple of weeks then good to go.
I ended up going the nitro carb route (also recommended in the conference seminar Bruce pointed me to). 40psi @ 33f for 4 days was the suggested method I'm trying. Then I'll drop the gas down and raise the temp up a bit to serve.