I suggest a compressor on the guitar for when it peaks.
To me its not Darkly Soothing more like Lightly Soothing.
if by bottle neck slide you mean the random pauses not so good however the majority sounds good is that you on the guitar? if so good job needs something else hsnt quite earned soothing more edgy seems to me but its missing maybe a subtle percussion to mellow it maybe i dont know a tamberine cause it sounds almost like a vacation in the islands and the tamberine would suit it great not to sure bout darkness of this sounds any thing but ... but great job
Please contact me if you would like to use this in a project. We can discuss the details.