As a relatively new player who plays mostly online and hits the casino when I get the chance, I hesitate to respond to your question because I know there are lots of other posters here who have lots more experience. However, I can't resist putting in my $.02...

I would expect that your B&M game would be a bit different from your online game - maybe not in the mechanics of the game, but in other ways. The casino table is different in that there are lots of distractions going on - not like sitting at the computer in your comfy den. For those of us who like to multi-table, playing only 25-35 hands an hour can make it even harder to give the game the appropriate concentration.

Like you said....1800 hands, although it is a lot of time at the tables, is a small sample. There's been several posts recently about downswings...we all have them and they're part of the game. For me, sometimes just stepping back for a couple of days and doing something other than playing poker helps my game when I come back.