Tips for sidechaining properly:
The sidehchain should stop shortly before where your kick's tail ends. Use a volume automation to calculate how much sidehchain there needs to be. And then get a millisecond to bpm calculator, and use that for the gravity's threshold
(I know you already figured out the sidehchain, but this is for next time you struggle with it)
And if your kick is still weak, find the kick's fundamental (100hz or so) and take 3 db at 100hz away from the synths