As they say on football replay, "Upon further review", I must report that the adjustment screw rotation is opposite of what I thought it would be. I kept a faulty controller that had been replaced, so in case I ever needed to replace another controller I would have the info.
I just looked at a tiny diagram on the case beside the screw and it illustrates turning the screw counterclockwise increases the amps.
I know now that I actually decreased the amps! I hate when I confuse myself.
Anyway, my slide-out is working.