1.3 ohm should be fine for a spinner. I believe that 1.2 is the limit for a spinner. I would certainly keep the voltage turned down to start.
I use a 1300mah spinner occasionally and try to keep mine around 1.8.
My spinner will fire
coils lower than 1.2, but have felt some heat at the top cap.
Too low on a spinner will cause the internal wiring to fry (don't ask me how I know).