One good way to gain match is to play one speaker set (left or right) at a time, use a mono track and play with xo and decibel levels of each driver till it sounds like a point source. The bass notes should sound as if coming from the speaker and not the woofer.
Apply the same settings to the other speaker.
Then play them together and look for the centered stereo image and further fine tune to your taste.
Try with a variety of songs from the mellow to the energetic. Tuning an active setup is a long drawn out process and patience can reap great rewards.
I am an out and out go with your ear guy.
A simple multi meter and sine waves will also be helpful in setting gains.
Also since we are using multiple amps, the idle current (DC Bias) is critical (critical in passive setup also, but more so in active) values should match with the specification of the amp. DC bias will have great impact on dynamics (if below threshold, you will miss dynamics, if too high it is bad for the amp chips). Most high end amps allow for adjustment of bias, go though the service manual. You can do this with a multimeter. The adjustment will either be voltage or current (amps).
The other critical adjustment is DC offset. It should ideally be between 0/20 mv). Most modern amps have inbuilt circuits to control this automatically, while some need user intervention. Look into the service manual.
Happy tuning.