I took strength on my back from 63 to 68 and swapped out my % fake gear for %BT gear before season 16. Spin was at 7 that year, 10 the past two. Look at the difference:
http://goallineblitz.com/game/full_player_stats.pl?player_id=1090750&playoffs=0Hard to tell which factor contributed to the huge increase in season 16, but I am sure the strength didn't hurt.
FYI...I was in USA Pro Season 15 and 16, WL 17 and 18.