"The technical challenges were really amped up," he said.
"In the final, the exam was only 50 minutes compared to nearly five hours in regionals."
Mr Fitz-Herbert said preparing for a contest of such a magnitude was always hard because contestants never knew exactly what would be asked of them.
"I did as much study as possible, but it's really just experience in agriculture all round which helps the most.
"Generally, they ask questions about the sponsors' products and agricultural things that are unique to the region, so I did a bit of background on forestry, which is strong in Taupo."
Mr Fitz-Herbert still left with $15,000 worth of prizes, which included a quad bike and a chainsaw, after more than $270,000 worth of prizes were on offer throughout the contest.
He had competed in young farmers contests regularly since 2007, but said this time could be his last.
"You never say never, but there are other guys I'd like to see step up and have a go, so we'll see."
Aorangi equity manager Matt Bell won the 2015 title, which was his second national Young Farmers grand final, after coming third in 2013 in Auckland.