I don't know how handily you get your acres harvested with what you have now but if your machine is stock without feeder shocks or extended cylinder bars you could expect quite an improvement with a few upgrades. Was it the size of the head that limited your capacityIJ Shouldn't be to much to do with them few hours unless you have rocks, edible beans, or abrasive crops. I would check chain tentions, zero out concave, check and or turn chopper or impeller blades, check helical height if they are not chromed, change all oils and filters, align main drive and hydro belts, check retaining hardware for tention, set intake and exhaust valves, blow out engine and coolers, check pulley and gear setscrews. More or less just grab your book and start at the front and work your way to the rear. You may just find one thing that could hold you up this harvest but that would be worth it. As far as upgrades I allready mentioned the shocks and extended bars but don't forget about third helical extention, removing wires from grates, reverse cylinder bar removal, half height cylinder bars. If you have any specific questions when you are going threw her just ask. Have a good one.