Easy dirty fix (maybe) - after each post(or every 5 minutes, if the server is slow) take struggle_coef=sum(posti*posti_depth)/sum(posti), use then some coefficient to convert (like ramp(struggle_coef-2) and divide whatever weight algorithm is already giving. Also :Care-Comrade:

Edit: probably better algo-comrades are somewhere here, so maybe workshop it a little bit together with the site, would be good fun and community building