I also run the HD rear springs and I like them.
I had the Medium duty springs on the front and it did sit alittle nose down. I ended up getting the Rustys springs for the front and now it sits perfectly level.
You could do a clevis lift on the front to help level things out, but mine still sat nose down with the clevis lift.

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster