What's the best way?

Playing a mid sized map, six teams goiung well but have just juped into a system were there are two planets (now neutral) following a Novialith blitzing but both planets have Orkulus starbases romaing around them. I've tried a fleet of torpedo cruisers (10 - maybe not enough) and a fleet of bomber loaded liht carriers (10 maybe not enough again). What's the best way to take these things down?