Danny Wilson admitted London Welsh have much to work on after they scraped home by the width of the proverbial fag paper on their travels for the second week running.
Three Mark Harris penalties saw the Dragons overturn a 14-10 half-time deficit to win 19-14 at winless Manchester to remain third in National One.
But for Wilson, just as at struggling Otley the previous weekend, Welsh failed to convince their forwards' coach have the appetite for a sustained promotion challenge.
The defence caught most of the brunt of Wilson's wrath, who promised to work hard on the training pitch prior to this weekend's home clash with Nottingham.
"Not wanting to take too much away from Manchester, but that passage of 10-15 minutes in the first-half was probably the worst we've defended all season," he said. "We've defended well so this was out of character, but it's definitely something we will be looking at this week."
Two early touchdowns from Paul Sampson and Tom Brown put Welsh in command. But a 14-point blitz from Manchester's Gareth Wynne meant Harris' trusty boot was needed to save their blushes.
No such problems for London Scottish in National Three South as they maintained their 100 per cent record with a 10th straight win, 45-10 at Lydney.
Second row Iain Fullarton's brace helped the Exiles to a 31-10 half time lead, their other tries coming from Owain Walby, Raynn Bruce and Gareth Swales.
Swales completed his own double after half-time and Duncan Hayward added try number seven, as Scottish stayed eight points clear of Ealing at the top of the table.
Rosslyn Park stay third after beating arch rivals Richmond 23-6 in a match held 126 years to the day after their first meeting.
A fixture steeped in so much history was settled by a try on debut for Alex Cadwallader.
The young centre came on as replacement to add to earlier scores from Jake Strong and Nick Canty as Park wore down their resilient near-neighbours, whose points came via two penalties for Luke Cousins.