Thanks for your input guys,

I will go ahead and do the tailwheel mod for my own peace of mind.

I think I will also go ahead with the 155. It is both lighter and less powerful by 1 hp than the DLE 30 which IS a recommended engine. I just thought it strange that the person who responded to me didn't seem to realize that fact. They specifically market it because it has "more power for the same size as a 120."