Haha Boris! I wish you good luck with this tactics!
I tried the same tactics a few seasons ago 'cause I was sick of always losing in the first two rounds of the cup.
So I lowered my quality as well and I was put for the first time in a cup of my level! ( there were just a few managers in there that were 1lv. above)
But you know what happened? I WAS TROLLED IN THE FIRST ROUND AGAINST A TEAM THAT WAS ABOUT 8 QUALITIES LOWER!!
That was one of the most ridiculous games I've ever seen and I'm still very angry about that today!!