Dont remove fins - as I assume you love the board as it is, so dont "destroy" this.
Important that you move the kite overhead in one continous move.
But you know that, as you can tack your other boards.
The Nugget is wider and bigger finned, so one trick can do it all for you I think:
Even when you push with your back foot, you just push on your fins, and nothing happens (unless you edge the board too) - it gets "stuck" at a high angle to the wind, and turns no further - and you fall
The trick is, to PULL with your front foot, before losing too much speed, and when you are pointing high - then you will discover the board effortlessly turns on a dime (actually on the fins, just like we do with race or freeracefins as this is the very trick)
Try it - you might need some "getting used to", as you havent done it this way on other boards - but believe me, it works and can give you miracles in terms of turning a big finned board easy
You can even stand further in front with your rear foot, so the board does not sink, when you learn this technique.
Pushing with your rear foot does not work well, or not at all, when big or many fins.
Of course, on a Nugget, you should be able to turn the board by weight on the rear foot and the outside edge - instead of keeping it flat, but you got that it seems, and your problem is the last and most important part - to get it through the wind eye
Let me hear how this "pull" trick works for you ?