I think the QV victory time could stay the same (it makes it really hard right now but I like the challenge). I'd rather have another 15 seconds added to the overall battle time. I often see myself with 90+% having troops left but running out of time.
According to Tin the idea was to make 5 starring worthwhile. If that's the case then they should also add 10 or so secs to the QV, as OP said, to still allow us to get 5 stars, while making it harder to do so.
Another 100% attack but missed the quick victory, oh please!
5 seconds wouldn't be too much, or at least give us more research to increase battle timer and/or quick victory.