i worked on a couple hills kinda like urs tho not as long 30-40 ft .mine has,no run,big roots at top of one.the other has a rock pile in mid and curves at the top w bump.i use first on some,lean fwd,steady throttle.don't play w the throttle,u'll loose momentum or loop.simply give it a little clutch if u loose traction or the front starts up.if ur on/off the throttle things get jerky ,momentum lost or wheel over.proper clutch use lets the front roll up n over those little gems and u don't miss a beat.be confidant !!!! other things...indecision kills,r u sure it's a 1st gear hill....some i do in 2nd or standing,no way to get a better run at urs?rest still applies,keep in mind i'm a work in progress ,this is what i've found to work....i or it may b all wrong,i'm sure i'll b corrected :)