Donald, I am another die-hard Berkley Big Game (clear) leader guy. Have been for many years. Now, I have gone through an evolution of sorts over the years as to what pound test is best suited and I agree that for the deeper fluking applications with heavier jigs (over 4 ounces), 40# is ideal. When we were catching quality fluke here to the west in 20-40 feet of water (relatively shallow) on a consistent basis, I scaled down to 30# Big Game and was very happy with it. What I found with 30# is that if you stretch it slightly, it gets "wirey" for lack of a better term. Curly, you might say. Has much more memory than the 40#. So, now I go back and forth between the two, depending on how / where I'm fishing and because (as you know) I ALWAYS bring 3-4 set-ups on every trip, I'm usually rigged with 30 on my lighter rods and 40 on my heavier sticks.
I've never been a big proponent of fluro for a few reasons. First being, it's too expensive. Second, it's very hard / stiff line. Third, it has a ton of memory. Fourth, it's never been proven TO ME, side-by-side to make a difference. I'm NOT saying it doesn't work, I'm just saying I've never personally seen it be the deciding factor in who caught fish and who didn't on a consistent basis. That being said, I believe many "tricks" we use when fishing are more for our satisfaction than the fish. If using fluro makes you a more confident angler, you'll have more success. That, I happen to believe, is a major factor! Confidence is our best weapon.