I just swapped from Thunder Burts to Gravel Kings on my Functional bike, as I'm doing more road on that bike at the moment. They feel fast but they are skiddy, accidental whip skid when I came round a corner and was faced with an approaching car on a narrow country lane a little while ago. I am not dead but yikes!
I liked the GK's (prefer them to Horizons) but I found them very temperamental to pressure like the Horizons. I low-sided mine on a corner I was very familiar with. Lowering pressure helped massively. Try that.
I just swapped from Thunder Burts to Gravel Kings on my Functional bike, as I'm doing more road on that bike at the moment. They feel fast but they are skiddy, accidental whip skid when I came round a corner and was faced with an approaching car on a narrow country lane a little while ago. I am not dead but yikes!