The Sky Blues have conceded seven goals in their last three matches despite Clinton Morrison and Leon Best continuing to find the net.
"This is definitely, in my time, the best we have had because these two look like they are going to score," said Coleman to the CT.
"But what they do first of all is the hard work. "What we have to do is be a bit better defensively because we are giving away silly goals.
"If you look at the last three or four games they have been exciting and entertaining and we have got to keep trying to score goals and shore it up a little bit at the back."
"Nowadays in modern football you have got to keep asking the opposition questions and rather than keep sticking with one formation, if it is not working then you have got to change it, and a lot of teams are doing that now and we shouldn't be any different," said the advocate of a 4-1-2-3 line-up.
"Our strikers have got 10 goals between them in nine games, which is a really good partnership, and in that formation we are creating chances and look solid in midfield, so it is definitely something we like.
"But we have got the capacity to play more than one formation and it just depends how the game is going, do we need to get back into a game or are we hanging on to a lead.
"I just wanted to keep the three up, Michael McIndoe, Clinton Morrison and Leon Best in the second half against Boro, and try to get Aron Gunnarsson and Jack Cork joining in when the ball was going forward.
"And it worked because we put pressure on them and got the rewards in the end.
"I have played it a lot since I have been a manager. I played it in Spain, where virtually every team plays 4-1-2-3 or 4-2-3-1.
"We call it 4-5-1 and sometimes it looks like that because if you are under pressure then you can turn it into that and pack the midfield.
"But since we have done it this season we have tried to go 4-1-2-3, which is a completely different formation, but it is very flexible."