Thanks Josh for your answer.
I have read about the Epic and seen a couple of backpackers with an Infinity in Sandy Bay. Check out the bar of the fat lady and the epic infinity very closely, also check the design features ... they could be twins .. I don't really care who borrowed from whom but they resemble each other pretty close. I guess the characteristics in flight are also very similar with the three struts, the thinner leading edge then most others in that size.
Regarding the Core 19 you mentioned. I would not go for a 19 because I am not 100kg+, the 17 would do for me with 85 dry. The 19 should only bring marginally more in the low end, which is not really that significant with a big board. I am certain that I will get a Core Riot XR2 13.5 eventually anyway to bridge the gap. Not just the LW from Core are lighter, all Cores are light compared to my Norths for example and they pack much smaller. I really do like my Cores but the 3 strut design of the fat lady and the epic for that matter appeals more because I expect them to be even longer in the air than a Core.
I guess the differences of a fat lady and an epic are minimal and it comes down to price and what bar you can use with it ..
I do not feel like buying another bar (even though a longer one might be handy), but I'd rather use a North 5 line or the Core 4 line if I can, preferably the Core because I find the system superior to the North in the latest generation .. and the lines are stronger.
I don't expect wonders but anything in that class is better than my 16m Rhino.
Do you use the epic bar or anything else ?
I think that the Fat Lady can be flown 4 or 5 line. The specs on the website do not say .. how good is that ?

I might be blind though and did not see it ...
How about the epic ? same thing ?
The manufacturers should put decent specs on their websites because all the retailers copy them and you get nothing but incomplete info in a couple of google pages. For example: North does not even specify weight on their boards ..
Anyway .. I think the epic and the fat lady are pretty close on paper and in real live from what you read from independent sources ... I mean I do not read the marketing hype and the dealer statements ... I compared some statements from dealers here with my real life experiences and found that I better not listen to biased statements anymore .. I mean that's common sense anyway isn't it ..
thanks for your time
regards
gmd