maxle lever is very loose
I don't think all Maxle's are the same, but I've had two different types and each could be tightened in a slightly different way.  With one (I believe an older design) there is a 2.5mm hex bolt on the lever end which you can tighten/loosen to affect how tight the lever is.

See an example of this here:

http://www.bike-manual.com/brands/trek/om/assets/pdfs/09sram_maxle_cengdfjnp.pdf

On the other, the lever could be tightened by pushing the end in and twisting.

Explained in this article about half way down:

http://www.bikemag.com/gear/news-rockshoxs-pike-is-back/