Look elsewhere

I purchased Filmic Pro to gain more control over the video camera in my iPhone 6s plus. I most notably wanted to control the white balance and focus. I read reviews and saw what controls Filmic Pro had to offer and went ahead and purchased the app.
Over the past week Ive been playing with all the settings and must say the controls work as advertised, however theres a problem thats made this app unusable for me. When panning a scene the aperture is very slow to respond which leads to your scene either being way overexposed or underexposed. It seems that most of the time the exposure wont change until I place my finger on the exposure control, then it corrects itself.
The other thing that annoyed me was file naming. I wanted to compare videos shot with the OE camera and Filmic, when you export to camera roll the file is renamed to a very random filename. Even consecutive files have completely different filenames. After having shot about 15 different videos on different settings I had no idea which was which. Why not retain the same filenames as displayed in Filmics built in viewer?
The app sounded much better than it really is. I wish I had my $10 back!

Tv watcher3423 about Filmic Pro－Video Camera