Something I've learned recently that has helped me alot, thanks to HOH volume 1, make sure you realize how your table is perceiving you and act accordingly when you slowplay.

Example, if I'm playing tight but got a rush of cards and won most pots without a showdown, the table is looking at me betting out playing alot of hands, so I do the same thing and make my standard bet/raise depending on position.

Think about your table image and playing accordingly and you will see alot more profit out of slowplaying.

*lesson and example all found in HOH volume1