Hi, I like thrash, so I thought I'd give my input on your map:
Source - maybe add album title
Outer Isolation (not sure, maybe
Demolition)
HP - I think can be 6
I see several places where kiai timer is suepr short, you should probably make it longer or move it elsewhere altogether.
00:08:974 (3,4) - consider adding drum or clap
00:11:974 (3,4) - ^
00:04:924 (1,1,1,1) - consider adding soft whistle
00:07:924 (1,1,1,1) - ^
00:10:924 (3,1,1,1) - ^
03:09:699 (1,1,1,1) - ^
03:12:824 (1,1,1,1) - ^
00:10:474 (8,1) - I hear a sound in between them, maybe add something?
00:13:474 (8,1) - ^
00:13:924 (1,1) - consider adding whistle
00:14:524 (1,2,3,4,1,2,3,4) - a bass changes tone, maybe add whistle?
00:24:274 (2,3) - I hear a sound between them, add note?
00:24:424 (3,4) - ^
00:34:474 (2,3) - ^
(I realize there are very many places where the sound is not added, so you decide whether you want to add them)
00:43:324 (9,10,11,12) - add drum/clap?
00:49:174 (8) - the stream starts in the middle of the slider, and it's painfully loud. Maybe shorten the slider and add 2 circles after it, so the stream starts earlier?
00:54:124 (9,10,11,12,13,14,15,16) - maybe add drum/clap?
01:21:874 (4,1,2,3,4,5,6,1) - in this whole part I hear a lot of missing notes in between circles, maybe something like
http://puu.sh/kRduC/978d4c5b9f.jpg ?
01:23:824 (2,3,4,5,6) - not sure if it should be a stream, because in a very similar place you mapped 01:28:324 (1,2,3)
02:00:724 (1) - this is a burst not a single note imo
02:13:324 (1,2,3) - this should probably be a stream
02:13:774 (4,1,2,3,4,5) - this should be a continuous stream (add circle between)
03:12:355 (8,1) - I hear a sound between, add?
02:52:355 (4,5,6,7) - ^
02:18:124 (3) - this should probably be a burst
03:10:792 (3,4) - add drum?
03:44:353 (1) - new combo?
A very nice map overall, I'm giving it a star, because osu needs more real metal
I assume you've already checked Mazzerin's mapping, he has several great maps, at least 2 of which are also Vektor.