My pleasure.
Clinical: Everything is very sharp, very strong separation between instruments with different tonal values. Highs will tend to be very clear and crisp. Excellent for, say, electronic music and bright music.
Warm: The harmonic content of the sound has more of a full and lush quality. Goes great with string sections of orchestras in Classical music. It can be a little more forgiving and easier to listen to.
Yes, the warmer sound will be less harsh. I tamed the 900s by going for a tube amp. The 900s are very clinical compared to others. That is, everything is very bright, and well-defined, therefore, it can get fatiguing to listen to after awhile.
One choice I made, personally, was to compliment the 900s by also buying a pair of Sennheiser 650s. In some cases, I like the 900s better on very technical music. In most cases, I like the Senns a little more, because they're just easier to listen to. But when I want the music I'm listening to, to really pop, I go for the 900s. The same type of distinction can be made between solid state and tube amps. Solid state: Clarity and pop... Tube: Warmth and easier to listen to.
I think for EDM, the 900s are great, and I wouldn't recommend a headphone side-grade. You could look at improving the power behind the sound (which will give more punch to the sound) by upgrading to another AMP. There are a few good ones in the $400 range which have similar sound quality to other amps which cost 3-4 times as much. You could still use the Fiio DAC, or upgrade the DAC as well.
"Unfortunately," you wandered into a mess where, generally, if you spend more money, you get better sound.
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Could you describe "warm" vs "clinical" sound? I will search headfi and google it, but if you have a simple answer, i'd love to hear that as well. I'm sorry i'm definitely a noob. I do definitely enjoy the sound of the 900's and they work well for what I listen to (95%+ EDM). Would a warmer sound be overall less harsh? For example sometimes the treble is just too piercing for me on some tunes, forcing me to adjust the volume lower than i'd like which makes me miss out on some of the subtleties I really value in Trance. What would be the most logical path for me? I realize that's hard to answer for someone else especially in regards to which sound i'd prefer to pursue, but logically what is the next step up to bring out the best in these cans?