why no stumping? dont the stumps have to come out anyway? add another 3k to bid and secure the stump work too, rent an excavator. up sell man! it would make skidding the logs out easier, stumps would get in your way with a tracked bobcat if you plan on moving the wood. blowing chips on site would also make this job easier.
100'x100' is a small lot clearing job and it sounds like every tree is chippable as whole. not sure what size chipper you have. 15" chipper with winch and a small ex is all you need. bobcat would help with forwarding but not really needed with trees that small if used chipper winch. with stumps pulled id be at 5k and be done by lunch time. to be honest I think you are high on your bid with no stump work(which is the more time consuming part of the job).
Its hard to compete on a bigger job than you normally do if you dont have the big machines to use. How many trucks do you have? running and dumping would kill a smaller co. on their bid. roll in with a fleet and roll out when finished, loaded, on to the next job.
On lot clearing we average 5k an acre with a 1 acre min charge.