You've really good pour the torque in to get them to lock. Shouldn't be too bad on your 2.5L.
I noticed an epic difference when I did mine, as I went from a 5-speed WRX "loose, open" drive line to essentially a 6-speed STI driveline
with the 2-way, where you were pretty much there already.
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The OEM STi 2way doesn't have a good initial bite and the pressure ring ramps are 45* angle. You need to apply a lot of torque for lock up. Upgrade pressure rings with 60* ramps and pinion cross shaft available from RalliSpec. That's my first step before jumping to a KAAZ 1.5way.
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Or sell and go the KaaZ but it will be more aggressive, not sure if you want that. It's not your daily ..