Anything under 4.0 and FH slice can be a huge tool of your game. When the ball is out of the strike zone, I now use FH slice as a defensive probability shot. So do most pros. Anything is better than blasting the ball into the net or back fence. Play the odds. Reduce unforced errors.
And, like you, I can hit FH slice with razor sharp accuracy, and it can even be offensive. (like placing a passing net shot) I've been doing slices since age 6, and it's like a 6th sense.
It's also a killer return of serve shot. (Think of how you effortlessly slice killer "winners" back when the serve is called out)
Trying to hit topspin winner when the ball is at my eyes? That's for 3.0 suckers. Read this: