You're doing it wrong.
But on a serious note, you're doing it wrong. The vast majority of a bikes "suppleness" is derived from the tires. You should have stuck with your 43mm GKs and set them up tubeless. Tubeless is the key here, it makes such a huge difference it's not even funny. It's a plenty supple tire but if you're looking for even more supple (and less durable) then there are other options, like Compass tires.