That's my basic set up
I prefer single position, I don't move most of them or change from my 4411 for many seasons.
I have a dc/dmc who is a sub and can allow 4141 a couple times a season if I need. I have a multi position sub for each flank, too.
Otherwise, my starting 11 have always been single position, more or less. (A few seasons had D/DM players starting for my ML/MR positions, they were good).

I've documented plenty how my old players, low quality team has defeated teams higher level, 20+% quality... Doesn't really matter. Results feel reliable enough to me that I have no doubt the right players make the team, not the average age, or quality. Manager tactics or individual players, one those I think is key. More than formation (not tactics) and training, I think. More than condition and motivation and win bonus.

Everything matters, just a little bit.