I called Bridgestone today and asked for one of their motocycle tire tech's. Turns out the guy track-days a 919 with Bridgestone tires....
I was told that the BT-16 front, BT-23 rear combination was a great combo and that he had been recommending this to others that called in. He mentioned that both models have similar tire profiles and don't cause any major handling problems. (he did however mention some of the other older models did cause these issues) He went on to say.....that they have been doing some testing on the BT-23 within their office, and that the tire is even proving to be an excellent track-day tire for anybody that rides within the intermediate riding group.
I've run that BT-23 pretty darn hard....and have NEVER had it slip.....but, didn't expect to hear that directly from Bridgestone. Cool stuff.
Take this info as you wish.
I guess there's some difference between Bridgestone usa and us - I use to work for Bridgestone here in DK., and as a rule of thump, we did never endorse this mix of tires ! (only did't so when talking to owner's of the old Blade's with 16' front wheel)
Just take a look at the profile of those to tires - there's a world of difference, BT23 round and "mild", BT16 edgy and tend to look narrow to allow maximum rubber to be in contact while cornering.
Let me ask - have you tried BT16 in the rear, and front at the same time, and what difference did it make to the bike...?
But I'll agree - within the intermediate group, I see no reason not to go with the BT23.
90% of all will have the best tire in the BT23, don't need great amount of heat to work, but heat up quick, hold's the heat just fine, when stressed - no sudden slides, just nice and easy when it goes, works also quite nice in the wet's - and give you mile after mile.
The remaining 10% will have the bike, that can put the needed amount of heat into the BT16, and keep doing so, and last but not least - remember they ride with a tire, that need's heat to work properly
Remember - if you don't have the bike, or what ever it takes to heat sports tires up - then don't go for them, buy Angel's, 2CT, BT23 Conti wht'ever'the'name'is, you will be much better of with this choice
By the way - if you want sticky tire's, try the BT003RS, road legal semi slick tire, remember tire warmers
Here's some track day pictures from the presentation of the BT003RS and BT16 in Denmark