TikTok Custom Comments & SMMPanel

So for the past year I've been using TikTok Custom Comments Service from SMM Panels for promoting my website, and results have been very good, just giving an example of around ~900 visitors for a day. Then, few months ago I've setuped my own sending script using TikTok Mobile API with Sessions, but when going with it, the results have been a lot worse, around ~200 visitors for a day, then if I were to switch back to SMMPanel for a day, then it's ~900 again.

Does anybody have any idea on what may be the issue with this, a solution, or perhaps knows someone who's 'from the top' of the SMM Panel that handles TikTok Custom Comments using it's own scripts/ways, whatever?