So this is the list I've been using recently and due to being a new player I would like some feedback.

Corran Horn with Predator, Advances Sensors, R2D2, Hull Upgrade

Luke Skywalker with R7 Astromech and Push the Limit

Airen Cracken

I've qent 3-1 against imp list made up with tie fighters, interceptors, and defenders.

Maybe ditch AS and try Fire Control System on Corran. Getting a second target lock to make the most of his double tap ability is a must!

Push the limit is also very helpful.

If I switch AS for FCS and predator for PtL would you suggest switching R2D2 and R7 Astromech so Corran has R7 and luke R2, and putting predator on luke?

Personally I like R2D2 on Corran as he is generally the focus of people's attack. You can double tap, zoom out and do some greens to recover then head back in.

Luke is already pretty defensive but with R2D2 is even harder to kill. Predator gives him more attack hit. Not tried R7 much but with Corrans high PS and FCS it would work nicely

I also find shield upgrade works better with R2D2 but not sure on how many points you have left

Play around, hope that helps?