And also said, unless the additional content such as company guildleves (and if it doesn't just combine into the 4 leves every 12 like I'm expecting), or the leve history/evaluation bonus effects SP gains on new leves taken, it will slow down all sp gains from leves for a lot of people.
I do believe SE intends for this to be slowed down. They have stated that leves aren't going to be the focus of the game any longer.... now you're seeing what that means.

I would also submit that, subject to testing, EXP bonuses from kill chains and from monster reinforcement add-ons could significantly raise the SP gained from soloing or PT grinding.