Tiredness mainly arises due to running, not hitting the ball with power...So, the feature needs a lot of tuning to be realistic, and that's why it's not used in the online tournaments. About the 2nd serve - yes, the stress causes DFs on 2nd serve, but it's a huge factor and most people would serve tons of DFs if they served a "double 1st serve"...I think Adner wrote more about this on the corresponding thread anyways. The return doesn't necessarily overpower the 2nd serve if you're varying your second serves well, so reducing the fh/bh to 90% isn't necessary - again I don't think it's a good idea to reduce the serve consistency to max 90%, so please don't start doing that without talking to more players...Anyways, the tiredness is configured incorrectly, I can hit the ball 10000 times but that won't get me tired as I could hit it another 10000 times for all I know - it's the running that makes us tired in real life.
I had only 1 desynch in my doubles set with Blacky on this build, so that bug might have been fixed now...but I'll see at the USO I guess
If you can't configure the 2nd serve on its own, try to talk to all the players, because I'm sure lowering the consistency isn't the way...but serving 5-6 DFs per 100 "double first serves" assuming correct left/right aiming (most top players really dont hit that many wide serves anyways) is very unrealistic. As for me, I will continue to serve mostly safe 2nd serves, 'cause any other way is just utilising the shortcomings of the serve configuration...kinda like cheating . Bye