I am a new Eq 600 user and would appreciate some feedback from experienced users regarding discrimination patterns. I have been using the stock Park I program to hunt a turn of the century park and have been digging far more trash than I ever did with my CTX. Since my goal is silver coins & older nickels & copper, I am considering discriminating out the numbers 0-11, leave open numbers 12-15 for nickels, discriminating out 16-18, leave open 19-40. What are the downsides of this pattern?