my S2 zetec turbo has cosie greens with a 2.9i fuel pump and omex and a fse fuel regulator set to 3 bar pressure

i went out today to map it past 14 psi so i upped it to 17 psi and began mapping and couldnt get richer than 13:1 afr

omex sujested doubling the mspb and halving the fuel map values to give me more range in the omex software so i have it a go and it was exactly the same

i have to mention i am using BALEST RESISTORS so the omex has the right inpedence for the 803's but is it posible this could make the injectors a bit lazy ?

i thought i would ask on here before blowing my cash on parts

so what do you think ?