Nicotine % isn't going to affect vapor output. PG/VG ratio will as well as wattage and surface area. Increase the surface area (larger single or multiple coils) to maintain flavor. Your mod has adjustable wattage so do a single coil, 3mm (approx 1/8" drill bit) diameter, 6 wrap, 26 gauge coil. This should yield an approximate 0.9 ohm resistance that your mod has tons of room to play with. Low enough resistance so you can dial it up on the mod, high enough that the mod's output will be accurate, enough surface area to maintain flavor, plus it's easy to build.