2.8b is very good!
One wish in comparing with Claymore:
1. Claymore have intensity from 0 to 16. 8 is default. If I use GPU for other purposes during mining (video, small games) Claymore miner just lower the speed and other 3D app runs good.
2. Phoenix miner have intensity from 0 to 14. 12 is default. Speed a bit higher than Claymore with default intensity in PM (12) and in CM (8 ). But Phoenix miner during mining and playing even weak games drops speed of mining even more than Claymore but gives less power to D3D app.
Lowering intensity to 9 in PM lower the speed but nearly not increase D3D power for apps.

Can you add in miner auto detection of D3D usage by other app and auto lower intensity for it? I just use my 1st GPU not only for mining...
Sorry if it too hard but Claymore can do that... I hope that you also can do that!

And another one question:

What about GPU tuning parameter in new kernels? Does it the same as in 2.7 or maybe 15 is not optimal now?