Before buying another impact be sure to check it's required CFM to meet that 1000 ft-lb rating. It would not surprise me to see it say something like 15 CFM. I'd be willing to bet that the IR impact puts out nearly an equal amount of torque at the same CFM (max of your current compressor) as the other.
Sounds like you've got some more help on the way though. Hope you get it and most importantly, be careful!
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