Stat. changes for 10 000 - 33 000 hands, better or worse?

I have now played over 33 000 hands. I now play NL on 3-4 tables and I play levels from $0.25/$0.15 to $1.0/$0.50 and I play both $ and £ tables. The stats have changed to the following:

PT stats. so far (with the old numbers from 10 000 hands indicated):

Hands: 33 636
Vol. put £ in the pot: 18.87% (21.26%)
Vol. put £ in from SB: 47.21% (57.41%)
Folded SB to steal: 85.59% (76.39%)
Folded BB to steal: 64.11% (47.62%)
Att. to steal blinds: 25.68% (29.90%)
Won £ WSF: 33.79% (33.82%)
Amount won: 1549.69 $+£ (377.83£)
BB/100 Hands: 5.93 (7.57)
Went to SD: 18.86% (20.23%)
Won $ at showdown: 50.36 (48.41%)
PF raise: 6.16% (7.32%)

Win%
AA: 87.58% (82.00%)
KK: 82.00% (73.81 %)
QQ: 65.24% (66.67%)
JJ: 64.94% (77.50%)
TT: 56.21% (60.62%)
99: 46.15% (50.00%)
88: 59.03% (64.10%)
AKs: 45.37% (59.26%)
AKo: 62.54% (55.00%)
AQs: 56.82% (64.29%)
AQo: 45.66% (55.34%)

Aggression facor ex. PRF-raise: 3.25/2.62/2.81 = 2.87
(3.05/2.99/2.11 = 2.87)
Aggression factor incl. PRF-raise: 0.43/3.25/2.62/2.81 = 1.01
(0.47/3.05/2.99/2.11 = 1.07)

Questions:
1) For some reason I am raising less than before even when I was going to focus on this part of my play! This could be due to the fact that I am playing at higher levels and gets more careful. Any advice for increasing the raising rate?

2) I have increased my win% for AA, KK and AKo but for the rest of the big hands I am doing worse. What could be wrong?

3) My BB/100 is going down quite a bit. Bad sign or normal?

4) Again the general question. Based on my stats, what should I focus on to improve? What changes have been negative or positive?

All I can suggest is to try to think of what you have changed, and reverse that change. Go back to the way you were playing and start the improving process over again.