A couple things I noticed:
1) Throw Glaive needs to be removed from the Casts During Momentum if you don't have Bloodlet. Felblade specs (which are viable in pure ST) don't prioritize casting Throw Glaive during Momentum at all. Likewise, you actually don't attempt to use every possible TG with Felblade, just when out of range or low on Fury.
2) Resource Management seems to be showing significantly more waste than WCL. See: http://www.checkmywow.com/reports/Bm8J9kAqP2xbzNFV/147808142/20?tab=resources vs. https://www.warcraftlogs.com/reports/Bm8J9kAqP2xbzNFV#fight=20&type=resources&source=337&spell=117
For one, it is vastly overestimating the amount from Fel Rush. It shows a base of 1100 from Fel Mastery, which is impossible since I only cast it 24 times (22 hits). Looks like it is assuming 50 instead of 25?
WCL also showing significantly lower loss from Demon Blades.
3) On the Cooldown Usage panel, I'm not totally sure how it is getting the numbers there... for example, Metamorphosis Effectivenes shows 10.6m damage during Meta. However in WCL I'm seeing 23.7m damage during meta.
Most things seem to be almost halved?
On the Total Eye Beam damage is shows 2.1m but the logs show 3.06m. FotI is 2.6m vs. 3.8m