I have to explain something first, for context:
I always play with special restrictions/rules I put on my self. One of my favorite rules over the years is to make Callum McRobbie, a football nobody, into a star. Therefore I must start him in every match I play. In my save, he is 32 years now and... well, cr*p. You have to include lower leagues in Scotland to even have him in your game.
Why am I telling you this? Well, in my Everton-save he is playing in the Premier League and Champions League with a small tweak to this tactic, and the team works great even with McRobbie on the field every match.
Since I changed to this tactic, with my small tweak, the results in PL have been 5-0, 2-0, 3-0, 1-0, 4-0 and 2-0 victories. 1-2 loss away against Lazio, but won on aggregate. So, a bit early days, but very promising.
The tweak is simple; McRobbie really is one of the most hopeless strikers you can find, so I gave him the role he was best suited for,: Poacher.
This probably gives him the least amount of influence on the game... which in this case is good.
If Callum McRobbie can make it work, imagine what even a mediocre quality can do. Imagine having TWO Premier League-quality strikers in front, which normal people do, and not having to compensate for his presence.
Change the right striker from pressing forward to poacher, and let me know how this tweak works for you.
Edit: Next five games: 3-1, 2-0, 1-1 (away against Barcelona), 3-0, 2-0. Defence solid, also scoring goals.
12 games, 10 wins, 1 draw, 1 loss.
McRobbie has 8 goals in these matches, five of those in open play. Two of them against Barcelona. Any tactics making him scoring goals is worth trying!