My team is only 109% and I have had real tough problem with phase 5 team. Phase 6 team is walk in the park. NO problem at all, winning almost all the matches.
Do not play defensively, I play normal/attacking style, mixed, mixed, no counter, high press and normal tackling and its quite easy. That Stronghold was nightmare.
I do play 4-5-1V so perfect for the phase 6 team