Ok. So, you replaced the old, soft, made for 25mph worn out forks and replaced them with performance\racing forks.
They should be stif. That feeling you have when you corner and it is all solid. That is how it should feel. I am sure the ones you have are just the spring ones vs the hydro style ones they offer. The spring ones are usually stiff and there is not much that can be done about it. But it is acting as it should. If it got soft all of a sudden that is a problem. This is the safest way to have your bike set up. Especially if you are going over 30mph and may really lean into a turn.
Good luck and ride safe.