I have this thought that higher it is the more pressure I get at the float.

Run your rodi to the other side of your garage. The pressure on that line is sufficient to push across the distance.

It was, by far, the best decision I had ever made. I kept forgetting to fill my reservoir. I don't think about it all now. About once a week I have to run straight rodi through to my sump because my top off is a kalk surrey. But other than that it's a completely hands off approach.