Hi there,
First of all congratulations on your setup.
Having owned almost the same equipment that you've procured I thought i'd add my 0.02$.
6/6.5 inch midbass drivers start to usually roll off around 100hz and their Fs(resonance frequency) is usually high as well.It is advisable to play as low as we can without bottoming out the driver.In the harsh environment of a car where road noise is a big issue,I wouldn't advise cutting any midbass driver especially a 6-er anywhere under 80hz.The advantage of running sealed is that the sub plays higher so use that.
Play with 24 db slopes around to avoid any phase shifts.Now the midrange and midbass i wouldn't cross any lower than 630hz on this particular set.
Use a track with good vocals to see whether if starts to get a bit harsh or not and experiment I think 630hz or upto 800hz should get the job done,again this is experimentation. The factory crossover point on the midrange and tweeter was 3700hz,I personally had it crossed at 3k as i felt the midrange became a bit choppy above that,again i'd advise you to experiment with 3k-4k-5k and even 6.3khz because results may vary on install to install.
An RTA is a great investment to identify problems in the spectrum,but for now you can just download the AudioTools application for android or a similar one for iOS to highlight any problem areas as well as match the response from the left and right side plus set levels for your drivers.This should be done using an uncorellated pink noise track.
For Time alignment my favourite track is Giorgio by moroder on Daft Punk's album "Random Access Memories".The vocalist is easy to identify and is dead centre.You can use your own track provided you know it's dead centre.
p.s the crossover points are the most important,once you get those right then you can build on that so experiment and use the points that sound the best and then work on them.The right points would be where you will retain all the detail without things getting too hot or displeasing,don't worry about them being unconventional as something that may work for me may not work for you.
Cheers and best of luck.