Is the OEM toplink hard to adjust because it's bent or because the the toplink is under load when you are doing the adjustment? Years ago I bought several toplinks, including a Speeco, thinking changing the links would be easier than making an adjustment when changing implements. Then I figured out if there's no load on the toplink, it's easy to adjust, and have no need for the extras anymore. I expect you already know all about that, but just saying...
Also, don't forget the "weakest link" principle... if you replace the weakest component (i.e. the toplink), with something stronger, the next weakest component becomes vulnerable, which is probably whatever the toplink is attached to. If it's the rear end that fails, it's going to cost a whole lot more than another toplink. Again, and with all due respect, I'm just saying the 3 point linkages should not be bending under normal operating conditions. Of course, if the original toplink was defective, that's a different story.
Good luck sorting this out, Jason. If you were closer, I'd let you have one of my spare toplinks.
Grandad4