"Perfect" didn't you?
If you hit slice after slice
from the practice tee, you shouldn't be
surprised when you do it on the course. You've practiced it.
Practice makes Permanent.
The good news is
that you are coach-able.
It's really simple. Change something
expect the same results.
If you change your mental game you
will improve your scoring. Changing
some or all of your equipment
will quicken the improvement