You hope for more coins, so that you have better chances for a big hit but notice that it would mean that other players would have more big hits as well so it wouldn't make winning any easier for you. Actually there could be a tournament where you can do just ONE spin and that's your final score. Such a tournament wouldn't be very exciting though...
Regarding strategy, playing less than 15 lines might be a good idea. If you hit large wins on the lines you include, you'd save coins from those lines you didn't include and those coins could make the difference in the end. TR has quite low variance so I expect quite small differences of win box values in the scoreboard. It has happened to me several times that a difference of 100 or less in final score has resulted in a difference of $100 or more in prize money (
one of these happened against vinylweatherman actually).
About large hits, 5 scatters (30 000 win) is probably the one to look for. Like VWM I have also hit it once, it was during $20k Weekender and it boosted me to 1st place. Slotbeaters shows the odds for five scatters as 1 in 150,000, so considering that you can do 120 spins in the first round (maximum bet), even doing all 999 rebuys would not be enough to quarantee hitting 5 scatters (1000 x 120 spins = 120 000 spins total). And most likely it takes more than five scatters to quarantee top position. Five scatters during free spins might be enough to do it.
I don't like the prize structure where $1M (79% of total prize pool) goes to just one player. $100k to top ten players would be better. Who needs to win more than $100k anyway