If it looks good on your monitor but bad on the projection- it’s the projection that’s the issue. There’s a wide spectrum of video projector quality out there. I’ve seen the same material look amazing on one projector and godawful on the next.
Perhaps there is a way to get a different venue or even rent a better projector for this venue to use. Spending another $500 to get nice looking projection could be something you work into your production budget.
-Noah