Well I'm not sure if autoflowering is dominant or recessive... guessing recessive... if so, then the F1 hybrids would be photoperiod sensitive, while in the F2 generation you would have 25% of the offspring show autoflowering traits. Then you would have to backcross the nicest, smelliest, strongest female of those 25% to your Lowryder male to lock down that trait and be sure that the dominant photoperiod sensitive genes are eliminated.
Hope you have some time on your hands!