Every time I read the title of this post I read it as 'tips on how to get browning'.
???That's Funny! Who would want to have brown leaf tips? ... But I can understand you thinking that!
anyway you bumped up this thread & I for one would love to follow this & see what the outcome is?
Too much fert? or too much light? Or too little humidity?.............
Jim, do keep us posted please & let us know what you change & how it goes?