I honestly don't think that Landorus is going to save Machamp Prime. Landorus Machamp is going to rely pretty heavily on going first, because most decks are going to be able to out speed, and a lot of decks are capable of killing your Landorus by turn two, making you lose your "energy acceleration". It is also worth mentioning how badly Machamp Prime can be hurt by Pokémon Catcher, you need a Switch to get it out of your active, three retreat cost is heavy, and Catcher puts a halt to Fighting Tag. Even against match ups should be strong, such as Magnezone variants and Zekrom, there is a large chance you will lose, simply because they can out speed. Landorus Machamp is one of those decks that is always one turn behind, since there is nothing that it can do with one energy on the field. If your Landorus is killed turn 2 by something like a Zekrom, or Magnezone, you are going to have problems, because you will have no energy on your field. That means you are going to have to try to build Landorus up again, which means it is begging to get killed again, because it will be in your active position with all of the energies on your field on it. You know what I mean?
I strongly believe you will never get a Machamp out against a good player. You will either face an energy drought, or your Machops and Machamps will get Catcher killed. Even when Machamp is out, it isn't all that. You are going to hit for 150 damage, and then get one or two shotted. Magnezone can break that whole set up by simply burning three energy. Just about everything else will two shot you (assuming they don't have a grip of Pluspowers), some things can even take a hit from Machamp if only 4 benched Pokémon are damaged. I'm not even going to go into how badly Mewtwo EX shuts Machamp down.
If you or anyone else is still interested in Machamp Prime, I would strongly suggest playing a lot of Switch, and Terrakion as a back up attacker. It may even be worth it to test out Shaymin UL and Electrode Prime. they can help you get ahead on the energy situation you may encounter. As for discarding Energy, play Sage’s Training, and Junk Arm, and you will be fine.