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You need a pretty tight fit with your mouse (but not too tight) and the more powerful the vacuum the better. If you have more than a couple of 90º bends it gets dicey as the fish tape can get hung up on the inside radius of the 90º. If I have long runs with multiple 90ºs, I add a pull string as I assemble. Can you split the run anywhere convenient and pull half way?
all a sewer tape is, is a really heavy duty steel fish tape, but was designed for punching a hole in a blockage, I was thinking of suggesting one, it would be much stiffer than a small electrical tape and in a large conduit I think it would work well, I have never tried one as I have never dealt with that large conduit on the farm here,
Push sticks/blocks Save Fingers
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attributed to Samuel Johnson
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I think just using a wider fish tape will help with pushing it.. However what seems to be the problem with using a regular fish tape in your 4" pipe? Is it a long run or lots of bends? Shouldnt be more then 360* worth of bends. You can try and put a larger head (bend the end of the tape wider) and that may help too. It should have a bent tip on it anyways, a straight flat tip will just get hung up on something. Try twisting the tape as well. Also, if you have a vac and don't have a mouse, a string tied to a plastic bag usually works in a pinch.
In a pinch I've taped a soda bottle on the end of the fish tape. Most of the time we use a shopvac or an air compressor. A plastic grocery bag made into a "parachute" blown down the conduit works well.