Matching fully balanced with unbalanced.

other words, run balanced as far as u can should be beneficial you think? ...  yes, unbalanced amp is equipped with XLR inputs.  

Of course testing and listening that for sure, but could any body throw scientific base under this topic?

I think all XLR interconnects are true balanced, rather components could be not even if they equipped with XLR connections.... I wasn’t trying to go chipper on my preamp..i just try to understand if it beneficial to go balanced as far as I can in the system chain if I have unbalanced amp at the end anyway. 

Tnx, atmasphere...full and argumentative explanation. 
 I knew the topic isn’t easy... but consensus should be reachable:) ... However, Physics is not Psychic. :)