Well an easy fix to a simple problem would be to make forum and in game activity worth the same, so instead of it being 75/100 for in game and 25/100 for forum activity points make it 50/50 so in game activity can pass a clan and forum activity can pass a clan.

Seeing how many clans are on the warning/failed list are mostly forum active and how very few official clans are In game active, seeming most of the activity in game is unofficial clans or clanless people. You can do /sa [ and hardly see official clans some days, so trying to force in game activity on paper sounds good and has a good motive, in practice it doesn't work seeming people have lives, and tb probably for most people is such a little thing in their life compared to seeing friends, working and etc.