For me I could not score as well without a plastic spare ball. I use my Plastic spare ball for the 10, 9, 6 & 3 on the Right, and the 4, 7 or 8 on the left. If I have a head pin, a 5 pin I use my strike ball down my strike path, If I have a bucket, or a sleeper on the left, I use my strike ball but go for the Brooklyn.
With the exception of the 10 pin I use the 10 board arrow, and for the 10 pin I use the 15 board arrow. Keeps things simple...
The best advise is to have a system, either make one up for yourself, OR use a tried and true system for getting those spares.