If you haven't heard the plans to nerf Afterschock for patch 9.7 have been pushed back with Riot Balance Team excuse that they feel like "they are rushing it".
What about we remove all damage from afterschock, because this is a Resolve Tree not a damage tree. And we make Afterschock give 35-65 bonus armor and magic resistance + 40% of the champion bonus armor and magic resistance ( The 40% does not count the actual resistances of the afterschock effect itself).
This will make Afterschock for champions that dont naturally build resistances, fairly pointless to pick, because the resistances that you will get arent significantly effective in mitigating damage. However this will assure that tanky champions still get the tankyness feeling that aftershock gives as they stack up items.