I've never played this CTTH before so thought I'd give it a go. I used a rapture 7 iron (rated 145 yards), full power and full backspin...it rolled further than it should, but I use starter balls (it woulda probably stopped closer if I used spin balls)
I think you're seeing problems because you're using starter clubs - not ideal for hitting close to holes where the green is very narrow, as they don't offer any spin...
Few tips:-
if you are playing with a headwind, use your 6 iron, full backspin. Try it with full power, or adjust down slightly if needed (can't remember exact yardages with those clubs)...(you want to be using just under 150 yards of power as a guestimate)
If with a tailwind, full power on your 7 iron, full backspin should do it
Adjust between the two for crosswinds
Rob
PS: Ignore the scorecard, I just wanted to get to challenge 5...honest!!! Lol