I have Axis Trads (carbon) but am shooting Easton Injexions (carbon inner covered by aluminum) the past two years.
With the Axis I add 50-100 grain brass inserts. I've found no way to change insert weight with the Injexions without going to outserts which I don't care for. So, I can modify only the broadhead weight to tune. So far only 100 and 125 grain field points are available for Deep Six threads the Injexion has. So, I had a several dozen 155 grain stainless field points (deep six threads) made to match the 155 grain single bevel broad heads I use.