Help - I can't place in the money!

[apoca3k]

Just started playing recently and have done quite well turning $40 into around $360 on $6 and £11 dollar 10/20 table games until bang I've hit a brick wall (after reading two theory books one by David Sklansky!) now i cant seem to win with any regularity anymore. I honestly think the books were great and I know my poker has improved but now im struggling to place in the money with any regularity - im down to $190 dollars now. I think a lot of this is to do with bad luck but I think something may be missing from my game that was there before. Any ideas anyone?