Hey Bandit:
The crappie here are slow on brushpiles and on the bamboo condos but it's just that time of year.
About four months after we dropped our bamboo condos they quite producing as well and I think that may be because the leaves finally started to decay, which may make the water acidic or something. I've noticed the same thing happens with hardwood brushpiles but it starts a lot sooner. The bamboo stayed green for a long time - like it was still alive - we were pulling green leaves up for a couple months - so it may take longer for them to "age" properly.
When all the leaves finish rotting off the little twigs and branches will still be there and then they should be good for a long time. We're still catching some of our best crappie on Greeson off a bamboo bed that was put down over two and a half years ago.
I expect to do real well this Fall on the bamboo condos we put down last Winter. I've come up with a new design for shallower water that makes them a lot faster to build and sink. We put out several last Spring in spawning areas and did real well on them. I think they'll have fish on them this Fall if the lake level is right and by next Spring they should be loaded.
Keep checking your condos and you'll know when they're ready. You may not be graphing many fish on them this time of year, especially up in the day, because they're probably way down in them enjoying the shade.