You would have probably improved it using Honing Powder afterwards but Hey-Ho, they asked you to do a job without chemicals and make it more slip resistant. You achieved their goal
. What Could have been or May Have been is not in the Equation really is it?
That said, If you had let "Henry Splash it All Over Hypo Cooper
AKA Mike Halliday on it he would have done it better though"
Good Job IMO