Wow that sounds a lot, even for a line of business type app with lots of external dependencies.
I’d say you should probably go through those dependencies, cross reference their capabilities with what you actually need, try to slim the app down by eliminating those that you can do without. I’m not suggesting to eliminate a feature (but might also be worth it in some cases) but to implement the feature with one of the other libraries or refactor the feature a little bit in such a way that your dependencies are optimized.
Make sure you are importing the parts of the libraries that you actually need. For example, if a library offers 10 different chart types and all you are using is the bar chart, then import only the bar chart if that’s doable with that library, most modern ones should allow for that.
Upgrade to Meteor 1.5 and begin using dynamic imports. This will allow you to load those larger libraries just in time at parts of your app where they are actually required.
Of course you should also use the new bundle visualizer to see what actually takes most of the space in that bundle.
This post from @sacha should help you get started.