I don't know BG soakers, but that sounds like a lot of layers of microfiber. Maybe your towels are different than mine (I got a big pack of them in the auto dept at sams), but I only use 2 or 3 layers.
Are you planning on making snap in inserts or actually sewing the soaker right into the fitted? I only ask this because I made some fitteds with the soaker inside and they take FOREVER to dry in the dryer (or on the line for that matter). I am planning on making snap in soakers for my next batch or maybe sewing them in in some way that they will be able to open up in the dryer.
Just some thoughts...
Married to my sweet DH and mom to Teddy (1-4-07) and Silas : (3-21-09)