So far I have come up with a bunch of lists whose original concepts were sound, but I tend to get caught up in the upgrade cards. Especially with the b-wings as they have so many slots. Then I try to figure out what upgrades to take out without hurting the integrety of the list, but the ships I ended up having to cut for the upgrades also caused issues. I usually end up with a butcherd version of my original concept that gets blown apart.
I still have fun and learn alot from each match which is why I play in the first place, but is there a general rule of thumb when it comes to what percent of your list total should be allocated to upgrades, and which ships are the exceptions?