To answer that question about the approach to catching,
It's for sure a work ethic with regards to getting a hook up. It can be hours, days, weeks of relentless casting and no guarantees.
For this reason It's important to get the lure out as far as possible time after time covering as much ground as possible, and make sure it's not too hard to wind in or your gonna get tired too quickly.
That's the reason why I designed a long casting strong lure that can be retrieved fast without too much resistance! (Tuna/GT Candle)
Having the right terminal tackle is also vital, as nothing worse than losing a fish too tackle failure!
I found time of the day is not so important. I mean first light and end of the day are always good fishing times, but I think it's more about when the Tuna are passing by, as I've had hits in the middle of the day! And no real pattern to the hits!
Hope this helped!
Cheers