Just like ANY OTHER advice on this board, some things may work for some and not others. When I RARELY rock a flatty, I use Sabino Moisture Block and a very light, small amount of Mizani Supreme Oil. No sizzle, no straight pieces. One pass through VERY small sections using the comb chase method. Nice light, airy flatty with a nice sheen to it and it takes about a week before I need to wash it out. I have to lightly oil my scalp every few days b/c my scalp stays dry when I'm not cowashing daily. I only rock a flatty for length checks/ trims and occasionally in the fall/ winter when I don't have to fight humidity.
Disclaimer: I DO NOT LET MY HAIR SIZZLE OR USE ENOUGH OIL FOR MY HAIR TO BE GREASY.