Wow, small world, I made an almost identical list yesterday, but for 2,000 points haha.
So, obviously, I think the list will do fine. However, I think that you can make a few changes
Get rid of the Deathwing Vehicle upgrade. In my opinion, the only thing that is going to one-shot it is probably going to be melta, or a giant
MC that would glance it to death with so many attacks anyway. And a melta platform is probably not going to get close enough given those hurricane bolters.
That opens up ~30 pts (if I remember correctly) to give your bike sergeants melta bombs, and possibly a combo-melta, just in case you need it. You could also give an auspex to the librarian (he's on a regular bike), which makes those plasma talons even deadlier if you need to ignore cover etc.
Personally, I give one of my bike squads plasma x2 instead of melta guns. With that many attack bikes I think you should have more than enough to deal with tanks. I keep the plasma because if the banner dies, it is nice to have some harder hitting weapons for anti-infantry duty that can pick up the slack. It's also nice to get 4 plasma shots and 16 bolter shots into a squad of marines or terminators etc, as it can thin them pretty fast. I like the flexibility, but that's just me

Plus, if you are firing one melta shot at a tank, all those bolters are wasted (usually). I prefer to keep the jobs more universal, and plasma can be good against regular troops in conjunction with the bolters.
- VardenV2