zippododa,
I would just stick with what you are using. 100 yards with 30LB mono and 2oz is an amazing cast, and much better than I have ever been able to achieve! I’m surprised that 100 yards of 30LB mono will even fit on a 6600 BCX. If you really need more distance, I would just suggest dropping down to 20LB mono and a 40LB shock leader.
In general, mono or fluro will cast farther than braid of the same diameter (not sure how to compare mono to fluro with respect to distance). That is, 6LB mono will cast farther than 20LB Power Pro (same diameter). It has been my experience that mono of even significantly larger diameter will cast farther than braid (for example, 12LB mono still casts farther than 20LB braid). This is because mono/fluro is stiffer….the difference between throwing an uncooked piece of spaghetti like a spear, and trying to throw one that is cooked in the same manner….not sure that makes any sense, but it is early.
However, since there is such a significant difference in the diameter to strength ratio, there are several advantages to using braid. Line capacity becomes a factor when going with mono, and to be able to take full advantage of mono you are probably going have to use a shock leader (not really necessary if you use 30LB braid with 3oz and under lures).
I know you didn’t ask, but this is free anyway:
Baitcasters will cast farther than spinning reels, but spinning reels offer a lot of advantages when throwing lures. One of the biggest benefits to using spinning reels is gear ratio. With the slower gear ratios of baitcasters, it can take a lot of time to bring a lure in after a 100 yd cast (where I fish, the last 50 yards is dead water anyway). Also, spinning reels are simply easier to use, and this is very significant when making up to 1000 casts a day. I use baitcasters (non-levelwind) with mono and a shock leader when bait fishing for maximum distance, but choose spinning reels and braid when throwing lures.