Hiya
Will the 8-9' rod cast far enough? Well, that depends on a variety of issues. The first issue is WHAT size lure are you throwing? We fish for yellowtail from the boat with 2oz spoons. I fish with a 11' Exage and a Toruim 30 loaded with 24kg (50lb) mono straight through. My wife fishes with a 6"6 Shimano jigging rod and a Shimano Stella 8000 with 24kg (50lb) braid. She can cast JUST as far as i can with the 2oz spoon, even though i have a 11' rod and she has a 6"6 rod!! The thinner braid helpd TREMENDOUSLY in adding distance to your cast.
Another VERY important issue worth considering is LEVERAGE. The longer the rod, the more leverage the fish has over the angler. The shorter the rod, the more leverage the ANGLER has over the fish. Yellowtail are dirty fighters and will reef you if you give them a chance. We often lose yellowtail, not even big fish, 3-5kg class fish, when you hook them close to the kelp or in shallow waters. They simply reef you, even with 24kg line.
Check out this video clip. See how long it takes my wife to land a yellowtail compared to my buddy with a 11' Exage. This shows you what i mean when i talk about LEVERAGE. On the same trip, my buddy hooked a fish on the surface, it swam straight down, taking 60m of line off the reel (we were in 60m water) and reefed him. Thats was probably a 10-12kg fish, so be warned, BIG yellowtail are RIDICULOUSLY strong!!
[flash=425,344]http://www.youtube.com/v/vRcFIIEG5Zw&hl=en&fs=1[/flash]
Your best bet is to take some rods to a field and test them with the size of lures you'll be using. That way you can get a very accurate measure of how far you're throwing.
The drags on these new breed of fixed spool reels are also insane!! The middle of the range Shimano Saragosa 14000 or 18000 puts out 44lbs of drag. You top of the range Stella's put out 55lb's of drag. Compare that to a Toruim 30, which only puts out a mere 20lb's of drag, whilst a Trindad 30 only generates a maximum of 22lb's of drag.