The humidity should go down this winter. There is a big difference between a basement and an insulated space at ground level. Remember, the ground maintains a fairly constant temperature year round and as long as there is no water problems (infiltration), with good ventilation, then the humidity probably remained fairly constant and lower then the outside. Different story with the garage. Fluctuations in temperatures and exposure to outside humidity are the problem.
9-11% is really not that excessive for wood. Sorry, but that is probably the reality for your part of the country. Try living along the Gulf Coast from Texas to Florida. I'd be grateful for those kinds of figures.
I guess I'd have to ask what the average humidity level inside the house is normally. I understand your concern, however, be realistic. If you are building "fine furniture" and are worried about severe shrinkage once it moves to a permanent home with a lower moisture level, then do what some folks do...take the wood and store it in the house so it acclimates before you use it. This way if you are shooting for that mystical ideal percentage there won't be a drastic change when it is finished and inside for good.
Hi, sorry I missed you. I have gone to find myself, but if I return before I get back, please ask me to wait.
Nothing ever gets built on schedule or within budget.
Tool Storage Bait and Tackle, LLC.