That all depends what you mean by "Breadboard".I also wired the radio as per V2.0 on a breadboard and this gave as poor results as the actual
populated circuit board. There is really not much difference in the layout.
I am wondering whether the breadboard is also a poor RF design
If you mean one of those matrix boards where you plug the components into strips - it is a wonder that it works at all.
If you mean a sheet of copper clad board with the components soldered directly to the groundplane and all signal connections made short and direct, then I am surprised that you had poor results.
Have a look here:
https://www.electro-tech-online.com/articles/breadboards-how-bad-are-they-at-rf.278/
for something which I wrote here some time ago.
JimB