I've only watched Bi-Slobs, but I think you can do this. It's pretty draggy. So I think you need a heftier engine than a Fox, for sure, and perhaps a slightly different ratio of stab to elevator chords. I don't know off-hand what the horizontal tail size is, but 3/16" sounds a bit thin to me. I think that 1o - 2o of out-thrust is, OK if you use it. 1/4-degree is hard to measure! You'll probably go a bit further back on line rake, but with adj. leadouts, you'd do well. Otherwise, how about 3/4"? There are some very experienced Bi-Slob builder/fliers here; maybe someone has converted one already.
SK