Nigel Davies was left "bitterly disappointed" with Gloucester's performance after seeing them crash to a 22-17 defeat to Leicester.
Gloucester out-scored Leicester two tries to one but poor goal-kicking proved their downfall as they suffered a fourth home loss of the season in the Aviva Premiership.
Rob Cook converted Jonny May's try with Freddie Burns slotting over from his own breakaway try but both men missed two penalties apiece as Gloucester went down to another demoralising defeat.
Director of rugby Davies said: "I was bitterly disappointed to lose like that. You have to have parity in the set scrum and take the points when they become available.
"There are a lot of boys in the changing room, (who are) very upset about their performance. We played with plenty of spirit but we are not accurate or clinical enough and things have to change."
After Burns and Cook missed with two kickable penalties, Billy Twelvetrees was called upon as third-choice kicker and he succeeded with his only chance.
Davies said of his side's kicking: "We measure the boys and they are tested in training every week. Freddie was the most accurate with Rob second but obviously it didn't work out on the night."
Leicester's only try came from Dan Bowden in the first half with Toby Flood kicking the remainder of their points.
Director of rugby Richard Cockerill was understandably pleased with the win but admitted they were left sweating at the end.
"We needed the points; it was a very important game. It could have gone either way but any win on the road is a good one," said Cockerill.
"For 25 minutes in the second half we had no ball and at the end we were hanging on by our finger nails. All credit to the boys for hanging on in there but 14 of their points were obtained cheaply."
Leicester now face a tough away game at Saracens in the Premiership and back-to-back European fixtures with Montpelier which Cockerill conceded would be difficult.
He said: "We've got to improve but we can beat anyone on our day and hopefully we may have a few of our injured players back."