From what I have read, the V2 is designed for indoor use so is not really set up to detect people 30 feet away. I think 20 feet is pushing it.
If you have enough light outside, turn off the IR. I am in a condo so shoot thru a window. I have to keep the IR off, otherwise it reflects off the window. By turning it off, it keeps your V2 cam less visible to people anyways. I think this also eliminates some of the bugs being either attracted or being detected.
I keep a 32gb card in the V2. I just use the App for the live feed, or to go back and review things and edit out a block of video if needed. The 12 second clips are OK. Most of what I check on is related to noise outside.
The higher the sensitivity, the more things you will pick up, not the less. In theory, you could piggy back a V2 next to or near a WOC. Use the WOC around the clock, use the V2 for 24 hour footage. That’s under $100 for both units fully set up, less if the V2 can be in doors. Not a bad combination seeing the WOC apparently has the better detection capability.
I think, eventually, we will be able to configure some interesting triggers. Like if a WOC detects movement, trigger a light to come on, trigger a V2 somewhere else to do something.