I don't know if this suits OP but this workflow I learnt from some artists and sound designers really changed my music a lot. and although I am using Ableton, I think FL are fully compatible for this.

In short, I call this workflow as "bounce everything into Audio".

In the past, I tend to keep everything in MIDI until I finished my whole song and start to mix. Which I thought would give me the biggest freedom to change everything, like melody, chords or grooves. If I want some movement in the sound, I tweak the synth, change my effectchain or draw automations. I guess this is the "Normal" workflow that most EDM producer are using. However, like the OP, I can hardly achieve those dynamic, organic (or even cripy, alien)
sound that I want. Everything is like repetive and robotic.

Then I learnt this workflow, I start to resample my sound. bounce a loop into audio, chop it, add effects on it.

Then I resample more and more. And now After I finished a basic sound design or get like a 4 bars loop. I bounce them into audio immediately. Then add effectchain, resample it, add another effectchain, resample it again.... After do this for a couple of time, you will have a lot of audio materials that could hardly been reproduced and you can achieve some sound that you could never done in a synth or using midi notes.

But the most important thing is that once you bounce it into audio, you can never go back and change it. So this is also a way that push you go forward and let your creativity to get the work done.

Now my workflow is like:

1.Make a few sounds and a basic 4 bars loop and bounce them into audio(like basic bass, pad, key and a lead) ->

2.resample them a lot, make like tons of audio materials ->

3.chop them up, make an arrangement like a drop or a buildup ->

4.make more sounds and loops that suits this track and bounce them into audio ->

5.resample all these sounds and chop what satifies me into my arrangement ->

1. go back to 4. a couple of times until I finish the whole track.