I am a user of the same camera you have, sineoji PT716V, I do have PT713V and PT528V as well. Your information was incorrect, probably you are not familiar with the parameters and settings. You have to play it more often before you get it correct. Let me correct you and guide you through.
Motion recording can be recorded in FULL HD but you need to set it to 1st stream and turn off the 24 hours recording option. Besides, the 6fps is baseless as you claimed as that is the frame rate based on live streaming subject to the bandwidth of the network such as your mobile data network. Not the recording. Check out my motion detection recording with the same camera as yours sineoji PT716V, which I requested my brother to tigger the motion alarm in singapore with a recorded clip recorded and screenshot it with the media information. 25 frames per second.
Secondly, the reason why it was recording despite there is no motion is because you set to 1.
1 is the most sensitive and 10 is the least sensitive. You have to determine the best value subject to your environment surroundings. Obviously, being the most sensitive at 1 will trigger the recording despite no motion.
Besides, it is kind of contradicting that you mention it is recorded despite there is no motion and yet you claimed that only able to capture when object is 80-90% move off..which doesn't happen to me with the same cam I am using.
You claimed that settings will revert back to default settings once you click "view HD" on the Sineoji Plus phone apps.. its a bug... It is not a bug, you have need to define in the settings of the camera "the dpi" to 1st stream from 2nd stream. After you done that, go to your sineoji app, select HD mode. This will stay in HD mode even when you exit the app and log in again in the next attempt. But I turn off this feature instead, only when I need to view on HD, then I will tap HD in the app as I want to avoid enormous data usage on my data plan in case I blew it. But of course if you have unlimited data plan, by all means you can turn on that HD permanently.
I am currently in California and I verified what you claimed was incorrect by remote accessing my sineoji cam in Singapore, perhaps you are not familiar with the settings. As soon as you get your hands on it, this will work.
My favourite app for sineoji cameras is the tinycam Pro. That app is really top notched for professionals.
Cheers !