Karaitiana was one of the Mustangs' four try-scorers against the Orcas, as the teams were tied 22-all in the second half, before the visitors began to pull away.
Reweti said the issue was not so much physical fitness, with the majority of the team having played club rugby union for the season in Whanganui and Manawatu, but instead falling off their systems against a side who have played league all winter.
"It's just lack of footy, being focused and composed, sticking to the game plan."
They still gave a better performance than their neighbours the Taranaki Sharks, who likewise did not get a club league season, and were hammered by the Swords 56-10 last weekend.
"It will be a tough game, but we'll stick it to them and see how we go," said Reweti about tomorrow's match.
As well as Martin, who was excellent against the Orcas, the team will look to their veterans like fullback Corey Governor, who scored from halfback last weekend and has his son Jahlon in the team.
Kickoff tomorrow in Palmerston North is 2pm.
The Mustangs team is
1. Corey Governor (vc); 2. Leonard Matapuku; 3. Patrick Hiscox; 4. Haze Reweti; 5. Kayin Katene; 6. Jahlon Governor; 7. Bernard Matthews; 8. Taumutu Nohotima; 9. Hemi Hindmarsh; 10. Gordon Karaitiana; 11. Josh Brown; 12. Josh Kerr; 13. Woody Marton (c).
Interchange: 14. Brooklyn Herewini; 15. Josh Fifita; 16. Alex Nootai; 17. Hoani Rameka; 18. Joshua Metekingi.