-50mm was the problem - bugger all suspension travel, which = Captain Crashiness.
Suspension is the one thing on any car that's impossible to get right for everyone.
Yeah the Racingline kit is OK to a point, but on those days when you're kid free and fancy and full fat hoon, it's waaaaaay too soft. It's also the only suspension kit I've tried in 30 years of car modifying that caused MASSIVE understeer on a particular corner than not even the stock suspension even noticed, let alone anything else in the aftermarket. Sure, buy it if you want comfort, but steer well clear for fast road driving. It's just some cheap brand repainted in black to seem more premium than it really is. Mine arrived with paint chips revealing orange underneath. ST maybe? Or cheap Konis?
If it were me, I'd get a better quality kit with minimal to no lowering. You can run MSS springs on OEM shocks at standard ride height, or go for a better quality coilover kit.....but as others have said, I think maybe OEM kit might be the best option for kid duties.......but I guarantee the day you take it out for a Sunday thrash, you'll regret that decision