Tip play consistency

[HitHrdNDraw]

I recently had a Kamui black S installed on my shaft and it hits great, however initially it was very easy to spin the ball with minimum effort and after about 3 weeks of play, it still plays well but it is a bit more difficult to apply english... Why is that? also, is there a way to keep the tip playing like it was when it was first installed or do all tips get packed down and lose some of their initial feel?

 

[Tramp Steamer]

I recently had a Kamui black S installed on my shaft and it hits great, however initially it was very easy to spin the ball with minimum effort and after about 3 weeks of play, it still plays well but it is a bit more difficult to apply english... Why is that? also, is there a way to keep the tip playing like it was when it was first installed or do all tips get packed down and lose some of their initial feel?

There really isn't an acceptable answer to your question, Hit. Tips are one of those enigma things. A mystery wrapped up in a riddle.
I've installed hundreds in my time, and the only conclusion I have come to is that a player is best served by experimentation until the right one is found. And by right, I mean the tip that best suits his or her needs. The right feel, the right sound, ease of maintenance, etc. Sometimes it takes awhile.
Tips do play in, as it were. You might take your shaft to your friendly neighborhood cue repair person and have them reshape it. After that you can use a Willard to keep the tip fresh, but remember, when I say keep the tip fresh I mean it like taking an aspirin. Don't take the whole bottle when one will do.