Wales lost their three pool games on day one against Japan, Australia and Australia to drop down to the second tier Bowl competition on day two.
Hopes of a drastic improvement were crushed against England, despite Luke Morgan’s best efforts with a clinical brace of tries to equal Taliesin Selley’s Welsh record of 60 tries on the World Series.
Wales were in the hunt right up until the final hooter, but a turnover, not for the first time, proved costly and England raced downfield to earn a 26-17 win.
Luke Treharne and his men stopped the rot with victory against Canada but then Russia prevailed 24-7 in the Bowl final, overturning a 52-0 defeat from Vancouver.
Other than the remorseless efforts of Sam Cross and speedster Morgan equalling the Welsh try scoring record, there was little to shout about from a tournament which offered so much but delivered so little.
“Day 2 saw us drop back into an inconsistent state that culminated in an awful performance against Russia in the Shield final,” said Williams.
“The inconsistency was throughout our performances this weekend and a return to where we were earlier in the Series.
“Winning one match all weekend is an unacceptable return for a group that has enough experience to eradicate such inconsistency. However, opportunities were missed throughout the two days. We as a group of individuals are better than what we showed this weekend.
“Individuals have made some telling performances, despite them being in isolation, such as Sam Cross’ level of performance, Luke Morgan equalling the all-time Welsh try scoring record, and Morgan Williams in his first tournament, showing very positive signs of his potential.”
Wales have little time to regroup for the ninth and penultimate round of the HSBC World Rugby Sevens Series in Paris, to be played on 13-15 May, where they have been drawn against series leaders Fiji, Samoa and Scotland.
Singapore 7s results:
Wales 19 Japan 26
Tries: Luke Morgan, Kristian Phillips, Luke Treharne: Cons: J Williams, Phillips
Wales 21 Argentina 42
Tries: Williams (2), Lloyd Evans; Cons: Williams (3)
Wales 12 Australia 31
Tries: Owen Jenkins, Lloyd Evans; Con – Williams
Wales 17 England 26
Tries: Morgan (2), Jenkins; Con – J Williams
Wales 24 Canada 22
Tries: Treharne, Evans, Morgan Williams (2); Cons: J Williams
Wales 7 Russia 24
Try: Nicky Griffiths; Con: Williams
