I used to play a 3 - 4 - 3 attack with my team which worked really well and got my strikers a ton of goals. I played with two tall strikers on the outside while being centred by the smaller faster striker. With the three strikers you have though you only have Pogrebnyak who is tall so centring him seems to be the best option. But personally I think you should make Keirrison your central Striker, put Probrebnyak on the left side of the three man strikeforce but have it so that he switches positions with Keirrison so that he can drift into the central position sometimes and pull the ball out of the air when you play long ball. Have your wingers pushing up to support them too but it's best if you push them up from deep cause you don't want to leave your three man deffence exposed. Have the arrow poiting back so that your defensive midfielder is tracking back. Hopefully this will help your striker bag you alot of goals but if not then forget everything i've just said.
When i played 4-3-3 with 1 CM, it only worked with a quality box to box CM (Gerrard/Lampard etc)
I always like to have good width, and the celtic formation looks good (would it be with WB's or normal wingers?)
Pogrebnyak plays really well along side santa cruz at blackburn and they will both score a lot of goals from corners, as long as you set corners to 6 yard box with one player marking keeper and another near post flick on. 58 goals between them in all comps in first season.
dude i used to play with 4-1-2-3 with DM and 2 CM which must be creative! i used to play with Napoli and got Veloso in the DM spot and 2 CM Hamsik and Moutinho which helped my strikers bag alot of goals and i had Lavezzi,Vagner Love and Quagliarella so ya this tactic worked for me i finished 3rd infront of ROma and AC.Milan