Two weeks ago they just beat a fast-finishing Poland to claim the World Cup event at Eton Dorney - but considering their quality, it was noted as a far from perfect performance.
The crew, stroked by double Olympic champion Andrew Triggs Hodge, have now been joined by Olympic men's four gold medallist Alex Gregory and George Nash, who won men's pair bronze at London 2012.
And they will take on the University of Washington in Sunday's Grand Challenge Cup final, after they beat the Polish national eight by one and quarter lengths over the famous course.
“Two weeks ago, we were just ahead of the Poles and here Washington beat them by over a length," said head coach Jurgen Grobler.
"But we’ve made some changes in the eight and the guys have been going well.”
Elsewhere, Olympic bronze medallist Alan Campbell progressed to the final of the Diamond Challenge Sculls, where he will take on close friend Aleksandr Aleksandrov, who finished fifth at the Olympics and beat Slovenia's Luka Spik to make the final.
Olympic champion Helen Glover will join forces with Polly Swann, Frances Houghton and Vicky Meyer-Laker for the final of the Princess Grace Challenge Cup for women's quadruple sculls.
They will race California Rowing Club after they surprisingly beat the British squad quadruple sculls in the semi-finals.
Bill Lucas and Matt Langridge got the better of British team-mates and lightweight scullers Peter and Richard Chambers to make their double sculls final while two-time Olympic silver medallist Debbie Flood lost to current Olympic champion Mirka Knapkova in the women's single sculls semis.