Focal sopra 2/Gryphon Diablo 300 not good match

Try using a good tube setup with JPS cables

Speaker placement is every bit an art as well as a science. In your case it appears the science didn’t work, but you artfully stumbled upon a solution. Congrats, I’m glad you got everything sorted out.

cannot help you without knowing what are the parameters of your room

My experience with Focals is that they sound best with the tweeters pointing far behind your head. 

Now the tweeters are probably not directly firing at your ears. 

https://www.wilsonaudio.com/products/sabrina/sabrinax/dealers
Better speaker same money and much better resale value

I have to confess and update ...also in some Other forums witch I complain about the sopras. Reason : after almost 1 year!!! of trying speaker placement, (And believe me I move them 1000 times ..)even with an acoustic engineer (700 euro cost). the sopras sounded BAD. A few day’s ago I placed them (by accident)more apart from each other 3.5 meter and with a different angle The distance from my sitting place is 3.4meter but ...heaven is here. Even when the triangle is not “right”..everything is smooth now and center image is where it should be..the difference is unbelievable..totally different speaker.. Sopra is just fine now but placement of this speaker is unbelievable difficult ..