Variation between limits

[Mroberts3]

Do most people experiance significant changes in terms of SD, BB/100 etc as they go through the limits? I am asking because I was crushing .5/1 for 5 BB/100 and now am only beating 1/2 for about 1.25. From looking at my stats I have gotten significantly tighter and more agressive. My VPIP went from 18 to 15 and my PFR went from 6 to 8. Maybe my agression is to blind and not controlled enough? Players at .5/1 seem to call with anything, is this not true with 1/2? I would like to post my PT stats, but I don't know how. If someone could help me out, that would be awsome.