Yes. Years ago.
Depended on the individual. Sometimes 70s. Sometimes 130s. These were from "G" to "SG" pairings in most cases. Sometimes "SG" to "SG" with mostly similar results (some huge, some big, and some normal-sized). I also had a male from "SG" to "G" that topped out at like 55-60g.
His babies, though, would often get over 100g.
Yes and no. See above.
In my experiences, the mode of inheritance claimed was likely just slapped on there and was probably a colon-withdrawal.
It behaved more like a line-bred aspect (big geckos are more likely to make big geckos) than a strict co-dominant trait with a super form. I believe the claimed weight & length standards to be quasi-arbitrarily assigned and not necessarily reflective of the reality when growing out a large number of animals of known lineage. Partly matter-of-fact. Partly marketing.
I liked working with the giant line stuff in the context of other projects like RAPTORs and super snows. I eventually resorted to just describing the offspring of being from giant line parentage rather than trying to play around with claiming some little baby or juvenile was a giant or "super giant" sort of thing since I found that it often enough would not play out according to the claimed mode of inheritance and I did not want to mislead buyers with someone else's marketing materials in that way.