I don't think the OP is talking about bottoming out like hitting a bump too fast. He is talking about having insufficient clearance under the nose to maneuver a transition in the road without scraping. Same problem folks have when trying to drive onto the ramp of a trailer.
A skid plate will help protect the tupperware from damage as it will drag instead.
Approaching the 'ramp' at an angle helps as it gets one front tire climbing the ramp earlier.
Raising the front end with stiffer springs will help but will change your alignment so bear that in mind
and fyi....
Adding those rubber spacers under (or over) the spring will raise the ride height without changing the spring rate.
Adding those rubber spacers BETWEEN two coils will raise the ride height, but less so, and DOES change the spring rate. The springs get stiffer because rate is wire diameter X number of coils. Adding a block between coils eliminates the function of those coils as they can no longer flex. You now have a spring with the same wire diameter but effectively less coils = stiffer springs
Awwww, ya beat me to it!!!