First, of all. Thanks for the advice on messaging the data miners. I will do that as quickly as possible when the time is available.
Second, regarding the change. Yes, Im 100% positive of it. (Long progress of labbing is detailed below. Prepare yourself)
Ever since it was discovered in 1.1.4 that it was possible to break full shield with 2 moves, I decided to lab the buff and found an astonishing amount data on how to extend the possiblity to break shield with 2 moves. I decided to restest my 1.1.4 findings when some people in a crew that Im at, were complaining that they felt that the FSDA felt weaker. I was shocked when I found out that the D-tilt to buffered FSDA was no longer able to break shields. After further testing, I found out that it's other extensions (U-tilt, F-tilt and Gentleman combo) where affected as well (Gentleman, while affected, still was able to shield break like it did in 1.1.4 due to the fact the combo is spread into 3 diffrent moves, which reduces staleness.) After labbing 1.1.5 further, I was able to deduce that 1% in terms of shield damage was removed from FSDA and not the other attacks. This was proven due to the same two people I mentioned having found that Glide Toss with Gyro was capable of a 2 hit shield break as well in 1.1.4. When I retested in 1.1.5, I found out that the Glide Toss with Gyro was no longer able to break in 2 hits. Due to the incostitency of d-tilt to FSDA reports I was recieving (Some people saying that it wasn't breaking, others saying it was breaking) I decided to lab that combo further and I found the answer to the incostency. Right now, in 1.1.5, if you wait about half a second to let the shield drain after D-tilt connects, then FSDA will do enough for a shield break. In 1.1.4, that was not the case, if you buffered the FSDA instead of waiting, it would still break a full shield. (Important to note that I did not stay exclusively on training mode. Every single extension was tested and restested on Training and Smash modes in 1.1.4 and 1.1.5)
If there are any further questions, please don't be afraid to ask. Now, I will try to ask the data miners by messaging them. Hopefully, they will respond.