Just dit some testing:
Personal build - stock tune: 1:43.xxx
Same build - calculator 1:40.xxx
Same build - own setup with 1h of testing 1:38.xxx
So yes, can confirm the calculator works. Makes a massive differences in no time at all. Tweaking from the calculator you can improve further as well.
But was tuning for a competition so decided to go my own way.
Surely would recommend the calculator, makes a massive difference from stock.