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Ok, i hope you take this as intended.
For your benefit and your business, ditch the APC's and get some professional chems. You can go on truckmountforums or mikeysboard.com and get some good info on how professional carpet cleaners do it. You're working too hard for less than satisfactory results.
I'm not a carpet cleaner. But I've used Vacaway Hot Knife or Prochem Ultrapac Extreme to knock crap like that out. The right chems diluted with distilled water and applied @180-190 degrees with a sprayer like you used and then agitated with a brush will put an APC to shame.
Have something that's not a rat nasty. You can play it a lot safer and still get better results with one of the greener products like Procyon Extreme. Just remember distilled water and apply it hot.
I hope this helps you.
Oh, one more thing. Product suppliers like JonDon (or you can contact some of the manufactures directly - like Vacaway) sell spotter kits. With the kit you get access to lists of stains and the proper type of chem to remove it.