Well, the reduction in idea feel is directly proportional to how much longer over the original spec you make the forks. As I typed in the last reply you can get away with 20 to 30mm of longer fork but when you start going over 30 and range up to 50mm longer than what you have now then you're certainly going to feel the difference. And it's not going to be a good difference.

And the brand doesn't make any difference. It's just the way the frames are designed to have the correct steering geometry when used with a narrow range of fork lengths. Some frames, like yours, need shorter forks and others, like more expensive all mountain or downhill bikes, need long forks.

In your case you can pretty easily say that an 85mm travel fork won't ruin your handling. You will feel some effect but it'll just be "different" and not "bad". But put a 100mm fork on there and the results will likely not be that nice.