First off sincere thanks to everyone of you guys who responded to my
first post. I appreciated all your good advice, that the biscuits
don't really add strength in edge joining, to ensuring I work with the
good stock, clamping techniques, and all the rest.
I decided to take out the 4" cutter out of my Ryobi JM82 biscuit
joiner and measure the height of each of the eight teeth. Average 0.154", range 0.150-0.156. The surprise? The thickness of my Freud #10
biscuits was 0.151" (3 random samples out of the newly opened bag).
So, given some unavoidable wobble of the cutter, the slot will be
wider than the biscuit. I googled a bit, and found one story were a
guy had the same issue with his deWalt 557 (I didn't keep the link).
I'll go with my caliper to the local HW stores and see if other
biscuit brands have the same thickness. Another thing: When I soaked
the biscuit in water for 15 min. it swole to 0.161" and I was barely
able to insert it into the slot. I know it's normal for it to swell,
but should I use that technique to ensure a tight fit?