Krenov Style Smart Sawhorses

It’s been several months since I’ve been in the shop (don’t like working in a basement shop with no windows on a beautiful summer day). Needed a quick project to get warmed for the next major one-low entertainment center (in design currently).
I liked the idea of having some nice looking sawhorses for the shop, so built a pair from the Dec 09 article in Fine Woodworking “Smart Sawhorses”, using some oak scraps that were in the shop. The joinery gave me an opportunity to use my hollow chisel mortiser again, since the last time it was used was for the cherry/maple blanket chest. (Delta benchtop model).
Overall, was satisfied with how they came out, except for the wedged through mortise and tenon joint. I like using this joinery, but was disappointed on the rough edges of the bottom side of the through mortise caused by the hollow chisel machine. I sharpened the hollow chisels before using, and used a backer board to prevent blowout on the bottom side, but would have liked them to have come out with much cleaner edges.
Anyone have a solution for this issue?
It appears to me that the hollow chisel motiser works great for hidden mortises, but I wonder if the next time this joint is used it would come out better with a plunge router for mortising, and rounded tenons?
Opinions on this are welcomed.
I also got some good suggestions for avioiding the problem of the wedges breaking off when being inserted into the kerfs of the tenon-thanks guys.
Will probably finsh them with a quick coat or two of urethane to keep wood glue from sticking when I’m using them for assemblies.

-- Gerry