And by all means, experiment and come up with something you like. There's nothing special about what I came up with. My main point is that the harp is more than capable of a few adjustments to tuning, even while playing, so that shouldn't keep your piece from sounding the way you want it to sound.
I found this link about the harp when verifying some of the points in my above post. It has a ton of great information about writing for the harp.
https://www.harpspectrum.org/harpworks/composing_for_harp/composing_for_harp.shtml
The below is from Wikipedia, is this the mode you used? Sorry, I must have just misunderstood from your original post. This is a style of writing I haven't experimented with much, so I'm always interested in understanding the thought process behind the composers who use it.
https://en.wikipedia.org/wiki/Mode_of_limited_transposition#Messiaen's_list