Yeah, I am just wondering if the light weight pack is going to give me any overall benefit over the larger packs, but counting the 2nd battery swap into the total time, maybe not a gain there. But, I also have to pit twice regardless of whether I need to, to make it fair for the nitro guys...

But they say for the 2nd pitting, I only need to pit for literally 2 seconds and then off again.
Mike, I am racing in my converted Revo running my good old 1512/3D 1700Kv. and RX8, and at the track I was getting up to 25 mins on a 6s 4200 G3 pack, two 3s packs in series on each side of truck for cg and balance. So, going on that, the 3300 45C pack should be getting around 18-19 mins. I would only put back 2700-2800mah after 15mins running.
I am going for the Thunderpower packs this time around because they have a 2 year warranty, plus 50% off replacement for damaged packs. RCtoys or better known as draganfly are from my hometown here, so I don't have to pay for shipping cost, so they end up costing the same as Hyperion packs in the end. Hyperion would have been my 1st choice otherwise.