YS480 low temp question

I've had my YS480 for about 18 months and love it. Smoked/grilled lots of stuff... one thing I notice is whenever I lower the set point to anything lower than around 200 degrees, I start seeing smoke coming out of the bottom and around the hopper. So much to the point that I take the set point back up to at least 225 and it gets back to the nice TBS coming out of the stack.
Should I just ride this out when it happens and let it try to stabilize at that lower temp? I've always increased the temps back up for fear I'll have a hopper fire or something else.
Anyone else experiencing this.
Should I just ride this out when it happens and let it try to stabilize at that lower temp? I've always increased the temps back up for fear I'll have a hopper fire or something else.
Anyone else experiencing this.