Not sure if this answers your question, but can at least help with Aqualifters as I am guessing that that is the root of your problem.
1 - Aqualifters suck. Their lift is about 2 feet tops. They also seem to allow a siphon and get clogged if using kalk. To compensate, I have my water supply elevated to be about the height of the sump. Thus, the max lift is only about the depth of the water reservoir itself at worst - in my case a 10 gal tank. To prevent the siphon, the water tube into the sump is raised above the top of reservoir. To secure the water tube, I actually secured a pvc pipe in the tank which sticks up about 8 inches above the sump. I then secured the water tube inside the pvc pipe, but up high. This way the water tube is elevated but doesn't drip 8 inches down. When water is flowing, it tended to wiggle a little bit. By securing the tube to the pvc, I know it won't get knocked out an accidentally drip in the stand or worse yet all over the floor.
2 - instead of aqualifters, I will eventually use a very small pond pump. These seem cheap and pump a lot. You could use a high rated doser, but those cost about $100. My ATO system uses an AC power plug which can be limiting.
3 - Some ATOs have a warning system that stops everything if the pump is on longer than a certain period of time, say 10 minutes. So if the pump takes longer, the alarm will sound. Aqualifters are not fast, so it may be taking too long to fill, at least that is what your controller thinks. To solve, use a faster pump.