Congrats on your BBOM! I understand the effect you're describing, and I love it. It's like a third income earner in our family, pulling the load with DH and myself. When the BBOM has a good year, the results are damn exciting. YTD our BBOM is in the red, and so our 2015 results seem tepid without that big gorilla putting its muscle into things.
So even though the BBOM has a bigger effect than you do, mathematically, your contributions matter (and may be more consistent - portfolios do have down years.) Think of it as having a Mustachian spouse; two of you stashing makes it go way faster. And with this BBOM "problem", hopefully it means you are in sight of the finish line (or, at least, have a pretty satisfying NW.) I hope you can be excited for the gift (BBOM) your past self has given you, and think of yourselves as a team, getting you to your goal more quickly.