I don't know what you're talking about. I use my Soloist all the time and it feeds just fine. Admittedly, I lead with it more than I top-rope, and the Soloist is not the most ideal TR-setup, but it feeds through just fine if you keep a weight on the rope. A Silent Partner feeds better, but it doesn't work as well if you need to just hang (take) on the rope IME. If I were using a system for top-roping, I'd invest in a pair of mini/micro-trax. I have yet to see a TR system better than that.
I looked into various options. I will be doing some solo climbing next week.
I have an old soloist. hate the thing! want one - I may give mine away. reason: the rope simply does not feed well thru the hardware. by the time you manually drag the rope thru the solist - you ask yourself "what am I doing this for?". I wonder why the designers did not ask themselves the same question.
meanwhile ... I will use the simplest system in the world. pretty much infallible. I will just set a couple of independent ropes on the route with loops tied about 8-10 feet apart. If I adjust one of the ropes, so the loops offset, I can clip in for every 4 feet that I climb upwards. so I only need two climbing cords tied into my harness with a biner on each one and I am done. independently backed up and I didn't need to spend $$$ on gear.
the main disadvantage of my primeval technique: you can't rapp down the ropes with all the loops tied into them.
the main advantage: you have to be a complete idiot to screw this up. you are always connected by one attachment to a rope at all times, and usually two.