The Airlie Birds face Warrington Wolves in Saturday’s Ladbrokes Challenge Cup having, remarkably, kept Super League opponents scoreless in each of their last two games.
Leaders Hull confirmed their place in the top-four when beating Catalans Dragons 44-0 on Thursday night - just a week after winning 36-0 at Widnes Vikings.
Stand-off Tuimavave conceded: “It doesn’t get much better than what we’ve done in the last two weeks in preparation for Wembley.
“Keeping the scoreboard to zero has been huge.
“We have got some confidence from that because defence is what we pride ourselves on.
“It’s set ourselves up pretty well for the Challenge Cup final on Saturday but we have to keep it going.”
The Kiwi is part of a side hunting the treble in his first season since joining from Newcastle Knights.
The 24-year-old added: “I’ve won two under-20s comps back home and the New South Wales competition but nothing will compare to this.”