With foams on relatively smooth carpet, if you lessen the front static camber to around 1d and stand the shocks as upright as possible, 6d of caster can be effective through the switchbacks as well.
Always remember to reduce your static negative camber when increasing caster. Somewhere around .5d for every 1.5d of caster increase. So if you typically use 2.0d of front static camber with 3d caster blocks, switching to 6d caster blocks will require only 1.0d of front static camber in order to keep the contact patch more level throughout the steering throw range.