The Sapor is really intended for duals. I see no way to close off the other air flow. In that case, and considering you have nothing smaller than 26 ATM, you could try 11/10 wrap in a 3.5mm mandrel for .8 ohms in the 35-60 watt range. Or 7/6 wrap, same mandrel for .5 ohms in the 25-45 watt range. Of for more clouds, a 5/4 wrap, 3mm mandrel for .3 ohms, and burn it in the 20-30 watt range to keep radiated power in the green, or to sky's-the-limit for the biggest clouds you can get.
Ah, there's your answer. Try the 7/6 on 3.5 for .5 ohms as a starter. Adjust from there