duegi - you're on it.
I would not consider upgrading the 2.3 to 2.4 drivers. The crossover tunings take the cabinet particulars into consideration. Keep what you have.
Note that outboard crossovers can benefit from a different layout because the driver EMFs are no longer in consideration. Plus airflow can be utilized. If you are interested in considering my OXO cabinet and/or layout, send me a PM.