The Hana SL has been on my table for the past two years, running into a Parasound JC3 Jr. (which allows me to adjust MC load using a variable pot that runs from 50-550 ohms). I can say that the differences in load between 100-400 are subtle, but there is a more pronounced treble "edge" and a more brittle sound on certain vinyl when running below 300 ohms. This is likely due to a drop out of the upper mids below that 300 ohm load. As for gain, I can choose 50db or 60db of gain, and either 55 or 65db on your amp would work fine with the Hana.
YMMV, of course, and the Luxman phono circuit may handle the SL just fine. One other option if you are really hesitant is to return the Hana SL for the SH. It's specs are a much better match for your integrated.