Track half a dozen times. Then decide. You might decide not to change the suspension more at all, but at the very least by the end of those 6 track days you will have a much better idea of what to change. Your suspension setup sounds fine for starting out at the track. You don't mention what tyres you have though? Alignment specs? Any undesirable handling traits? Suspension isn't like a lot of other aspects of car tuning, you can't just keep adding parts and expect it to go faster. It is very possible to go backwards.