I agree with you,a rounder tip throws more,less chance of unnessary spin and throw with a flatter tipIMO , no.
It throws more.
Talk to Eric Crisp of sugartree cues..he once stated that the thickness of your tip is more of a factor than the roundness.
I've seen many strong/money players prefer to use tips that are half size in height than normal tips.
Thicker tips are heavier...hence more deflection. I have my tips cut down in more than half when they're installed. Many of the cue guys look at my shaft and can't believe i'm waisting half the tip.
I feel the ball more when the tip is not very tall maybe 3-4 layers.
I wish I had the link still, it was a high speed photo of a break shot as it impacted the cue ball, The tip compressed like you wouldnt believe ! Snip...
I have my own opinion, but unless someone takes the time to perform some accurate and repeatable testing, similar to what Bob Meucci did with the shot robot rig, this thread will be full of speculation and theory, and prove absolutely nothing.