This merely proves that you have a better timing with R1 serves than with regular serves...
"Sample size was 20 each, perfectly timed risk serves, straight down the T, average speed rounded. "
The timing is also different on R1 serves than regular serves. So a regular serve timing won't give the optimum serve using R1 serves and vice versa.
See above.
To further add upon this. Even if the timing feedback shows perfect, doesn't mean it is perfect. I can hit a perfect ace with pinpoint precision and the feedback sometimes show "Too late".
Perfect > Good > Too Early > Too Late.
Too late is the weakest timing and it produces the weakest serves (in terms of serve speed, not accuracy) while perfect serves are obviously the fastest ones. Which has nothing to do with the fact that perfect R1 serves are faster than perfect non-R1 serves. Which actually makes sense in real life if you toss the ball slightly into the court you can use your whole body weight to power it up. Venus serves pretty much like that, whether she advances to the net or not. There's however an increased risk in producing a foot fault which doesn't exist in TS4.
Thanks for reading!