Ya, I'm beating him in around 5 minutes now but that's after like 15 times with the GS. I was beating it in around or under 5 with the other weapons on my first try and I've never used those weapons before, I used the GS in Tri for over 200 hours.
It's just weird, like I said, whenever I use the GS in the demo the monsters are constantly in rage mode. I open with a might pill and a triple charge and then he goes rage and sliding all over the place making me spend more time just running around. With the other weapons they barely ever are raging. So it's not really that I'm having 'issues' with the monster or getting hit or anything like that, it's just that my openings are shorter because they are in rage mode so often and so that is causing my time to be a bit longer.
In the end it doesn't really matter if I'm killing it in 5 minutes or 10 minutes, it was more just an observation I had and was wondering if other people are experiencing more rage mode while using the GS.