Former Rovers defender Berg is searching for his first win as Rovers manager at the third time of asking, despite leading in both of the back-to-back draws against Huddersfield and Birmingham.
"I think in the last two games we've played better than the results we have got," he said.
"The Palace game was a different story. Palace were by far the better team than us and we learned a lesson on that day I hope.
"It looks as though we did learn. The Huddersfield game and the Birmingham game in terms of performance were good and we just lacked that little extra quality."