Damien Johnson felt his side's slow start allied to their inability to put the ball in the back of the net lead to their downfall on Monday night.
Rovers' second string slipped to their third Premier League 2 defeat of the season as they went down 1-0 away at West Bromwich Albion.
Caught cold in a chilly night in Kidderminster, a fourth minute penalty from the home side proved to be the difference on a night of few chances at Aggborough.
"It was a disappointing start from us," said the development squad boss. "We need to start better.
"When you are away from home, the first five-ten minutes you just want to keep the back door closed and we didn't do that.
"And at the minute we don't look like we are going to score too many and that is an issue for us.
"We dominated for periods of the game, but we didn't make their keeper make enough saves and that is something that we have got to improve on if we want to win games. If you don't score goals you don't win games.
"We were up against a strong side for this level, lads who have been in their first team. Between the two boxes there was nothing in it as we more than matched them, it is just that last little bit.
"But putting that ball in the net is the hardest bit of football, they are young lads, they are still learning and we'll keep on working."
The Under-23s are back in Premier League 2 action, and back in the midlands next Monday night when they travel to Walsall's Banks's Stadium to face Aston Villa.