Looking at the fender cyber se manual, at first glance it looks like the sysex format is completely defined on pages 29-30. However, digging deeper, there is lots of missing information. In the transmit presets message, the format does not specify which preset is requested. Without further data, you are doing exactly what you have to do to decode - keep everything static except one control. Move it to min - snapshot, move to max - snapshot, then compare. Tedious, but once you get into the swing it goes fast. One thing I liked to do is to drop the sysex messages into a spreadsheet to do auto compares. Takes a little setup, but the decoding goes much faster once you have it formatted.
Also, you are looking at the "one preset" message - you might also want to look at the "utilities" message - 01H. Some of the data you need might be there.
The outbound message shows a parameter number followed by a parameter value, what you have tried in your code below. But I don't see any such pattern in the inbound sysex, suspect it is just the data values in preset positions.
Are there any fender forums, where someone may have already completed the decoding? Once you have the coding in hand, building the layout is straight forward.