2 hrs at 225* is WAY, WAY, WAY, too long and hot for any shellfish.
I use an Amaz'in smoke maze and oak dust in a
weber kettle for both heat and smoke.
Open all the vents, light the maze and place it where you'd normally put the charcoal. Oysters take the smoke VERY quickly, so I smoke them for 20 to 30 minutes MAX. If you want them a little firmer place them on a cookie cooling rack then pour an inch or two of boiling water into a tray, place the oysters above the boiling water then cover with foil until they firm up a touch.
To store them put them in a Ball Jar and cover the oysters with cottonseed oil.
They will keep in the refer for up to 10 days.
I have friends in the seafood bizz, I had to beg for this recipe for yrs till they gave it to me. I buy 100 to 500 med sized oysters a few times a yr, and what we don't eat either raw or BBQ'd with in 2 days we smoke the rest and give jars away as gifts. Furthermore, I have people asking for smoked oysters all the time, they go nuts over them. I could easily live off of seafood yr round, it's by far my favorite food group.
I saw the part that you like them DONE, when you wrote "meat", in that case instead of shucking them raw, place them round side down on the grate over some real oak wood coals/ oak wood burn'd down to glowing coals until they pop. Then with leather welding gloves, tear the flat part of the shell off, close down all the vent except leave the top vent open halfway for 5 to 10 minutes, and they will be firm with plenty of smoke and not overly smokey.
Dan.