That's useful information. Im still running on BT021's!!!
I had the 021 on the rear for years before i was kind of cornered into buying a T30 due to a puncture out on the road, and was obviously quite happy with it, but when the T30 was put on it was a noticeably softer compound which obviously adds to better grip.
It feels almost spongy if you push your finger on to the tyre.
I was a bit gutted for a moment as i got a nail in it the very next day after it was fitted, but fortunately it went in at an angle in the thick tread part so was basically a flesh wound.
The grip though was quite impressive in comparison, it sticks like glue to the road in any conditions.
I've always mixed my tyres though so the 023 sounds like a great option for the front next time after reading this post.