And while scores from captain Rob Herring and Ruan Pienaar - who also added six points from the tee - confirmed victory for Ulster, a fourth try was not to be forthcoming as the hosts responded with Marco Barbini's try from the final play.
Kiss was frustrated at not being able to pick up the decisive score, although he gave credit to a Treviso side he considered much improved from the last Guinness PRO12 campaign.
"We probably left a point out there and we're probably disappointed with that," said Kiss.
"But we were playing a team that has improved. Kieran Crowley has come over and done a lot of work with them.
Conor O'Shea is also over there doing some work with the provinces and they're building a very good squad. "We have to take our hat off to Treviso, they kept us honest all game, but we definitely feel that there was another try out there for us.
"We went in with the mindset of going and starting well and we did that, but the next 30 minutes we were camped in our own half.
"We probably put the pressure on ourselves, but there was some good endeavour from Treviso.
"We repelled them and in the second half we moved the game in the direction we wanted to."
Guinness PRO12 Final 2017 Ticket Information: Fans can save up to 20% on selected tickets, and prices start at just €30 adults and €5 child, and be booked via www.ticketmaster.ie. For further information visit http://www.pro12rugby.com/final
Guinness PRO12 Ulster News
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