7.5mg peak effectiveness and Shotsy app

Hey all, So I’m on 7.5mg and have been for 5 weeks after a 2 week break at a higher dose that wasn’t for me. Anyway when will 7.5mg be at peak full effectiveness? Will it get weaker as some doses leave my body or will it stay at a steady dose now? My shotsy app says estimate level is 27.98 but next week after my jab it will be 16.79? Have I done something wrong on the app? Just worried if it goes lower over week 6-8 it won’t be enough for me.