[Question] Extreme storage and battery issues

Hello there, I'm on an iPhone 6 jailbroken on ios 8.4 with TaiG. I've been jailbroken for over 4 months and have been bearing with multiple problems for a while now.

Firstly, I've found that something is eating up my device storage rapidly. When I use my phone, even when I'm not downloading anything, I lose storage space in a rate of something like 3MBs per minute. Then I would need to use iCleaner to clear applications data, and I would free up gigabytes of space, only to experience the same thing over and over. Can anyone tell why this is happening.

Secondly, my average battery discharge rate is at ~1000mah. Why is that? I don't have any tweaks that are known to drain battery installed.

Thanks in advance.