Glad you made the effort though! Rushing is the difficult bit, but the adventure is the fun bit!
I've been to this area of Bangkok before - all the talk of your plans made me hunger for another visit!
You're right though. You've got to be canny on the street and in the markets - suffice it to say that they always saw you coming - and they're great at what they do (fleece you). This applies in a lot of stores in the Far East, not just when buying reps (tailors, electrical stores, 'antiques' - any tourist trap). The dealers take that crap on your behalf!