The job as you describe it is not one that I would take on. I try to avoid jobs with faxbacks and extensive travel (especially into remote areas) as they quickly fail the cost-benefit assessment. Also, my safety always comes first.
In terms of pricing, I've tried to narrow down the companies I work with to those who pay fast, have simple loan packages and aren't excessively demanding (faxbacks are excessively demanding IMO).
Companies I work exclusively with are:
Universal Notary (pay $90 in 3-4 weeks)
Excel Notary (pay $100 in 2-3 weeks)
Safe Signings (pay $90 in 2-3 weeks)
I've found these groups to be the most reliable in terms of quick payment and are all easy to work with.
I also have a day job, so will only take very local loan signings on nights and weekends for added income. If you're doing this full-time or are short on cash flow it will be harder to turn down work. That said, work with people who respect you and the work you do.
If a company calls you and says, "Hey, can you travel to X to do a signing tonight?" Don't be afraid to say, "Give me one sec, I need to check where this is." Then hop on Google maps and plug in the location and see if it's worth it. If it's not, don't be afraid to say, "Sorry, this one is out of my service area." They will call you again but remember they will usually call the most available notaries first, so it's a judgement call.
P.S. Do some research on all the notary forums and make sure you list your name in EVERY signing agency database that has a good history while avoiding those with poor histories. I know turning down jobs is no fun, but if doing the job makes you feel short-changed or taken advantage of, it's not a job worth taking.