Which CA? Maya is gooding, so does the Mogami siblings. Otherwise the Tone sisters are good too 

It's normal to earn 2k experience for flagship+MVP when fighting high level admiral with high level fleet (level 60 above). At your level, there will usually be 1 high level admiral (the first slot) and the remaining 4 admirals at your level. Your fleet will be utterly decimated by the high level admiral if he brings his big guns, but the exp makes it worth it. Once you gain access to BB, CV, and the CLT sisters (Ooi and Kitakami), you'll start to get consistent results (S rank and A rank).

depending on what quest are you capable of.
I would say keep the expedition always tracking becuz I usually forgot when they will return from their mission and the progress is counted based on successful returns
while anything else can be true on for tracking based on what are you doing.
Also, remember that you can turn off tracking and pick another quest as it only stops tracking your progress for the quest and not resetting it

Yes, either Chitose or Chiyoda (remember, both of them turn from AV to CVL in the 3rd remodel)

Kancolle Viewer using API

I don't think have the financial capability to support them 
On the road, it might just be flash projector with API
but at home, I'm using KCV+sanae on DMM with VPN since the API incident.

im using KCV + Sanae with API link