At .185 I would expect so.
There is a real problem with taking tops to a specific thickness, the problem being that the stiffness will be a random factor. Better to take the tops to a specific stiffness and let the thickness be a random factor. Because of the cubed rule of stiffness, even a few thousandths of an inch of thickness can vary the overall stiffness of a top by quite a bit.
I find deflection testing to be quite useful. Lots of info on the net, but in short...
The 'standard' setup is beams at 18" with a 5lb weight. Variations will work of course, the important thing is to take data and track your own work, and keep records.
As always, I recommend the Gore/Gilet books. Worth way more than anything else you could spend your money on in guitarmaking. Maybe not as sexy as a sweet set of guitar woods, but will definitely help you get the most tone out of your tone woods in short order.
As a start, .110 is the standard 'factory' thickness for spruce. It will still almost certainly be stiffer than it needs to be, but it's a place to start. I would build the deflection jig, measure the stiffness at that thickness, take notes, build the guitar, and assess it carefully, hopefully amongst peers, trying to decide if you could
out more bass or if it's too bassy already. That type of thing. Of course, many other factors come into play such as your brace mass/height/stiffness and the stiffness of the back as well. Which is why quantification is such a valuable tool. The how's and why's of which can be found in the books...
