[17/12,6/5,8] How can I improve ?

[13_Xerxes]

Hi, I am a very tight player on SH. That's my stats on my last 5000 hands. My vol. put $ in pot is only 17,1%, with a 12,6% PFR.
My aggr. factors are : 8,0 on the flop ; 3,5 on the turn and 3,4 on river.

So my questions are :

- I'm very aggressif (that's good when I flop a set or a flush), but I lose a lot a small pots : I raise PF in CO or bouton, flop nothing, I make a CB, get called or raised, then I must give up the hand [img]/images/graemlins/mad.gif[/img]
How avoid that ? Make more 2 barrels ? Check more often the flop ?

- I raise a maximum of hands, but I find 12,6% is too small. What kind of hands can I raise ? I raise KQo+, AJo+, A9s+, any PP UTG ; I raise suited connectors on CO position ; and a lot of hands on bouton (K9o, A3o, Q8s,...).
I don't understand how good TAGs can raise 18% of their hands [img]/images/graemlins/confused.gif[/img]

So, because of I come from full ring (I just moved on SH in december) I would like some remarks and criticals to improve my game, thanks a lot.