The important is to have some young fast training players when you tank, if you wanna do my strategy 2 tank / 2 play every tanking round one need to replace some players. About SA or new position really I think you dont need waste the cones in these, is more interesting have +30 cones added in skills by my viewpoint... but too is true that I bought 2 defenders of 4* and trained SA wall and aerial defender and went excellent for me... I still thinking that the wall is the best... penalties, free kicks and corners specialists I am tired to buy scouts with these abilities that fail in high % ... play lots of friendlies to have a good reserve of reds and too greens for the season you wanna play.

Tanking at your level maybe mean more opportunities for a treble than staying near the Top Server, because there are more teams in lower levels, so usually the game don't need to do cups of +4 or +5 levels for the high number of teams that have for example a Quality between 40 and 45, between 5 and 6*.. more teams that have the top server in this term. (thats depending of the server) so good luck and enjoy your team.