I didn't mean to alarm anyone! That's why I included that story about people solidly mounting their DCOEs. I think if you were having frothing problems you would be running lean and you'd probably have some spitting and popping from your carbs. If it runs good, you should be fine. As you say, unless you get longer studs, you don't have room on your studs to install Thackery washers (or their rubber equivalent) anyway.
If you're really curious about it, if you know who set them up, you could ask him about it or you can talk to Ray at r.d. enterprises or Ken at Dave Bean.