From official SI website - https://community.sigames.com/topic/404158-football-manager-2017-1732-released/
PATCH 17.3.2
Just a very quick note to say we've released update 17.3.2 for Football Manager 2017. This is just to update the in-game Twitter to work with the latest version.
Given...
I suggest that you read this - http://www.fm-base.co.uk/forum/share-download-fm-17-tactics/365798-most-efficient-way-test-tactics.html; in that thread, TFF explains many things about tactics testing, also, he shows how accurate any tactic testing can be and how many matches you need to test in...
If your players weren't familiar with the tactic at all(they start learning it from zero level) then it might take a while, you can speed up "learning" process by setting the match preparation focus to "Match Tactic" and arrange 9-11 friendly matches
I would go for "smaller and quicker" :)
For me it depends how many time it takes to train AMC position for a striker, for many good strikers it takes about only few months to get 18+ rating for AMC so there's no point selling them