if your 140' lbs and your running stock sprinds then you should have no problem, if anything i think you might be having trouble with the conversion from DJ to DH bikes...
im about 155' lbs and i run an 04' 888r with stock springs but had it rebuilt (oil, sleves etc) to cater for my exact needs, ive never bottemed out my fork, in the most exreme cases used about 7.5" of my travel...
my mate whos like 180' lbs runs stock springs, with just extra oil in his 888rc, som turns on his adjuster knobs and never has any problems with it, like myself...
how much travel do you use when you compress it with you arms just standing next to it, try hard, soft and really hard and let me know, i can use about 4" when i really try...
if its significantly more than me then you have a problem, if not then you just have to get used to riding DH bikes, and the point of soft squishy suspension you might ask is the obvious, to use the travel you have and make the ride easyer, because unless your using your travel then theres no point in having it and you mas as well be riding a ridgid bike...
let us know how you go...