I see your iron n oak has the wedge on the end of the beam instead of the ram like the huskey. I think your first modification to it should be an outfeed table. Make the able as wide and long as possible. This will allow the splits to be pushed away from the splitter and not stack up at your feet while splitting. I would then consider adding a log lift to get those larger rounds upon the splitter. Just those two modifications will increase production significantly. I would also start looking for a small conveyor so you can load your trucks or make a pile while you split, this would save a lot on labor and again increase production. I would then consider adding a 4way wedge, one of those slip on wedges will do or you can get fancy and make a hydraulicly adjustable 4way. Of course if you do all these modifications, your investment cost toward your splitter just went up to a factory bought commercial machine that already had all those modern features.
I am not knocking the way you are doing things, sometimes you have to do what you have to do, but I seriously think if your going to be in the commercial firewood business, you need to start thinking about ways to save money as much as you are thinking about making money. Anything you can do to increase production and decrease labor cost will put more money in your pocket. Face the facts, the less time you are splitting wood, the more time you have to do something else. Winter is almost over, I believe I would be thinking about making some of the modifications suggested to that iron and oak splitter to increase productivity, or selling it and buying something that is ready to go to work. You wont find a new splitter with all those features for $1000, but you could easily save the difference in price thru increased productivity and reduced labor cost.
Just my opinion