Good familiarity across 3 tactics?

Help would be appreciated here. As you know you can only train one tactic at a time and play with one, to build familiarity. Now if you build familiarity with 2 tactics, the familiarity with the third will decline. It may just be my lack of FM "know how" but if anyone could shed any light, I would really appreciate it. Thanks.

How different are your tactics or your third tactic from the others?

If vastly different with completely opposite demands then 'learing' this will take some time. I'd also argue it's a counter productive way to go about things.

I see the three tactics set up as one base tactic which is your neutral go to & then defensive and attacking versions with slightly tweaked instructions.

If you have a vast alteration in tactical formation/styles for your tactics then how happy are you with your 'number 1' tactic.

Think of it as you have plan A and you other tactics are plan B... Rather than Plan A to Plan Z.

According to the manual:

A maximum of three Tactics can be worked on at any one time; the Primary Trained Tactic will benefit from 60% of the contribution towards the team’s Tactical Familiarity, with the other two each gaining 20%. Familiarity rise and falls depending on the team and player instructions set in a tactic and is remembered across the use of all tactics. For example, if a player is tasked with Short Passing in all three tactics, his Familiarity will be higher in that particular regard, which contributes towards the overall score when extrapolated across all players and instructions.

https://community.sigames.com/manual/football-manager-2020/training-r565/