Best you can do is probably -1 SoBe, +1 Explosion.
Then you have to consider if it's worth doing -1 Catcher and -1 Nymph for a SoBe or Explosion or something else, because just removing 1 Catcher or 1 Nymph would result in either too much or too little
, though it -can- run on 4 Catchers, especially with SoBe in the mix.
Personally I don't like packing more than 4 SoBe in most decks. That 5th one is almost always dead for me, which can be disastrous when you're already trading card advantage away. There are exceptions in the fastest decks around, i.e. Monoair and BoomBalls with SoBe, in which case I usually pack 5. In those cases it's the 6th one I don't like.