Your flow on the SLS system sounds about right. It won't come gushing out, even at high RPM. By the way, be careful when you bleed at the rear leveling switch as the rear can lower and if you don't allow enough room you'll have a big problem. Be sure to use ramps at the rear and block the front wheels too as you'll be under the car with the engine running (it's necessary to run the engine so you'll have pressure to bleed the system).

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold