Problem flushing may be due to a blocked or partially blocked tank vent. If air displaced by incoming waste can't escape, the tank becomes pressurized, creating back pressure that prevents bowl contents from flushing. Another strong possibility: you aren't adding water to the bowl ahead of solids. "Dry" flushing solids creates friction in the bowl. If your toilet isn't designed to bring water ahead of flush, use a cup from the sink.
And finally...if your "upgrade" is the one that just replaces the manual pump with an electrified pump, even Jabsco will tell you it's a piece of junk. If you want an electric toilet, replace everything south of the bowl with a proper pump/motor assembly.
And btw...the macerator is just a metal blade IN a toilet or macerator PUMP, similar to one in blender.
--Peggie