Sipa the 1-way is from the old TA02-03 series. It frees the car into the turn as thee is no drag from the drivetrain along with the pull of a locked/spool front end.

For shocks I use the alum as they dampen better along with more precision on a bumpy track in can be a little to tall and restrict wheel travel. as for spring length I run no ride height spacers on the long shock body so ride height is about 3.5mm not sure how well it works with the Mini CVA's though