My NEW DeLuxe, used regularly, delivers a soft smooth shave ... unless I pressure it. I have a standard handled NEW DeLuxe of which I use very light pressure. The substantial head carries the weight to do the work. I have used a shorter, lighter Norfolk handle with excellent results, as well.
Bob, your problem may be the back balance of the heavier handle, where the original handle balanced superbly.
I have used many standard NEW heads, and while they may adapt to a heavier handle, the masterpiece of the NEW DeLuxe would appear to not only be based upon the fantastic head design, but also the complimentary classic handles.
You are absolutely correct. I much rather use a longer handled version rather than the shorter Norfolk style.
Bob, your handles tend to be a bit on the heavy side and as Guido said, these work better if the head carries the weight. For some reason these razor heads work better if they are top heavy. Give a light handle a try.