Hi Stanley, I have the FS 79H previous model (non nano), it can do I cup but saturates, I believe the other old Final Spirit 78XH was produced to properly work I Cups and 190g craftbait big mouth version.
The 79H can work G cup perfectly and 190g normal craftbait, I was told the nano version has the same characteristics but is slightly easier on your back due to the nano fibres.
Ryan, think your rod is the Reversal, top rod but that's the lightest model of popper rod in the range. There's 3 series(Flex, Powerfight and Final Spirit) above the Reversal that will handle bigger lures and enable you to do the big sweeping action and pop those bigger lures better.