Yes. Read the previous pages.
Yes and No. If you do manage to get a bonus high enough fast, you can skip directly to Indira or higher. But if you do not, you will level your intermediate hit girl so high while building your total speed bonus that you will need many month to catch up with your 14 positions girl. Or in other words: there is a Sanshi out there with 3M stats. And my Ice has 2M stats. I have access to Indira+ and even with double stamina of the 14 pos girl in contrast to my 4 pos Ice, the difference in practise is 46/42. And that is also the answer to the importance of studios: Nice to have, but there are diminishing returns in leveling the girls' stamina and even more diminishing effects in stamina effectivness for leveling stats. More studios makes you reach that wall faster. More warp gives you more girls.
Going for Lola or Cherry is not advised. Positions slow down noticeably around 70-80 and for practice slow down you need more than 200 stamina. So no problem for Sanshi and all girls after her.
Do not know if it stays, but I had 30 trys this day. Actually got 2 girls within 10 trys. But no chance for me on desktop. On tablet I had to switch browsers. I can not start Sweet Talk or the Event in Chrome. Firefox works. On smartphone Chrome works but device too slow.
Could be faster and frustratingly some motions do not get registrated, most noticeable if you hack the porcelain egg to pieces but not a single hit occurs. And you can actually see where the motion was. So, bugged or tablet to slow.
The best tactic so far for me is to point into the egg and move outward, away from any birds nearby. That is rather fast with a finger in contrast to a mouse. But I have to wait a tiny moment after each egg. I get to lvl 9 no problem now. Registering hits on a fast porcelain egg falling down is mostly the problem for me.