I've only got experience with the 0.7 but your numbers seem lower than mine, at least with 9.5mm since that's the lightest I'll occasionally shoot. The first couple tests I posted were with a much higher than normal elongation but even 7.25" active for about a 32" draw has 7/16" steel beating your 9.5mm speeds by almost 30 fps in some cases
I'm sorry, now that I look through the numbers much more carefully it seems our results may not be too far off. The last two or three tests I did didn't include the lead equivalent to 9.5mm but depending on a few things they've usually been around 30 fps apart, about 40 fps with much higher elongation.
Plus, with all those fun numbers in one place it's likely I may have misread something. Also, thank you for all the information. Numbers are like candy for the mind