Not enough info to fully diagnose the problems? We'd all be just guessing at this point.
A MM Cartridge will most likely have even more output, and would help nothing if you are going into the same phono stage without changing anything else.
But I suspect your problem lies elsewhere. Cartridge set up, in regards to alignment, and vertical tracking force will be two important issues you need to check.
If you say you're tracking at 1.9 Grms, are you absolutely sure of this? Has overhang-alignment been properly set?
What phono-stage/pre amp are you running into? What is the gain, and loading set at? Is your Stylus Clean?
Did you just begin to notice this problem, in other words was it playing OK, and now there's a problem, or is this a new set up, and note the problems? Used, or new Cartridge?
Please elaborate some more, and we'll all try to help. Mark