Yes mine is doing exactly the same atm.
Have a look for yourself if your bushes are cracked. Turn the wheel all the way out, and have a look at the castor rod. The bushes are this little circle thingy lol.. Wish i had a pic to explain.
Anyways you can either buy adjustable castor bushes which will replace those bushes or you can buy adjustable castor rods which will replace the whole unit. With the adjustable castor rods you wont have any more bushes, but will be replaced with pillow ball joints.. So you car will have more go-kart effect but you will feel the car a lot. By that i mean, you will feel all the bumps and shakes thru the steering wheel. Since our roads are so bad.
So thats one disadvantage about it i guess.. Otherwise they are great upgrades for better handling.
But i suggest getting adjustable castor bushes. More in labour costs, but will be better overall.
Do remember to do wheel alignment after it.
Im in the same boat and im going for adjustable bushes. So will let you know soon how i go. But it wont be for a few weeks.
But im sure SK on here will have a better explaination than i will. But listen to him hahah..
cheers