no-one can just tell you a good stack.
you have to practice with the race and try out new things for yourself and see what works and what doesnt.
I have a few tips for you though.
- Always use 10 stacks wherever possible
- Keep stack PR as close as possible to the stack above it
- when you cannot use the full 10 stacks use a single small dummy ship for the remaining few stacks until you reach 10 to prevent your fleet getting flanked.
- use of neutral ships throughout a fleet is essential