Interesting report Suavi,
I observe a lot with my 106mm F6.5 (I take the FL as 700mm) using both a 5mm Nagler (140x) and a 4mm DeLite (175x). Mostly I find that the 4mm does not show better resolution than the 5mm, just makes it a little easier on the eye. By this I mean that if I can detect a double star's companion at 175x, it will also show at 140x. If seeing allows I will push to 280x with a barlow, but using the barlow for 350x is futile and the view is always better at 280x.
The same eyepieces give 185x and 230x in my 132CFF. I have barlowed to give 370x with this scope but never used the 460x option.
I will say that the 132 at both 185x and 230x is superb and the use of the 4mm in this scope makes more of a difference than the jump from 5mm to 4mm than in the 106.
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