I would try using 16fps and 16000hz audio. Or 20fps and 20000hz, or 25fps and 12500hz, etc.
25fps=40000us
*12500hz=500,000,000
which divides evenly by 2000000 so I think it will stay in sync (but I have not tested super long videos due to lack of disk space on my laptop...)
I just want to confirm...is it 12500 or 125000? I am doing it again now with the setting of 12500 and 25 fps. If this goes well if this actually works...WOW you have literally helped me solve all my problem. With these settings I can finish my work
IT WORKS!! IT WORKS!! YOU ARE A WALKING GENIUS MAN, WALKING GENIUS!! You did it!!! It says video/audio timing accuracy: 100% Now I can do it FOR ALL MY VIDEOS and never worry again!! I am going to do 5 ren and stimpies in one shot converting!!

Ones these are finished I will upload my work on a rar file for download here..so people can start enjoy watching them..sorry for the old ones they where my first attempt so the quality and timing accuracy is not as good as the newer ones..but hey..I learned from my mistakes and worked in optimizing my work, that's thanks to DamageX and for the rest of the people helping me achieve my goal. Thank you guys for everything!
UPDATED NOTE:
Sorry, I was wrong
it did not work. It showed in the avi4hv conversion that they are matched and timed 100% when I played it on the hamp.run on the actual Amiga there is like 20 seconds difference between video and audio. Just to give you a heads up the original fps of the video before I slowed it down was was 29.970 fps and I changed it to 25.0000. By doing that the video is way, way, way slower than the audio ones I run it on ren.hv on the Amiga side. What if I wanted to keep it as 29.970 fps what would be then the audio side to match it with that fps or what recommendation you have? 