Hey Khris, I really apreciate your tips. I'm trying something related to it.
This begginning of season I bought 3 new players for this team: 2 new full backs from transfer market and a DC from scout list.
So I started the season with an almost brand new defense line (I'm keeping this Elfvin on the first eleven, on a line of 4 defenders). Things seems to be fine til the moment. I lost a match on CL, but oppo was same quality, I couldn't come online to watch that match and my team got totally dominated, so nothing "suspicious" yet.
This Burgos that you suggest, I think you're right. For some reason, he has poor skills but always performs greatly (as AMC). I need to find a place for him in that team (and spend some greens to raise his quality).
Half season I'll report back how's my team performance.
Thanks again and happy 2018!