I did this to my Baikal pistol and it did improve matters somewhat, but as Cinstone pointed out in his Shadow review, it may not last too long.
To do the job properly I would unreservedly recommend the thrust bearing, top hat and spring guide from Rich from Mich (link in 1st post) along with his trigger modification. Total cost incl. mail is $52. (ask Rich to put "parts $12 on the customs slip) You really will think you are using a different gun and I would guess that with a de-burr and regrease while dismantled, you will finish up topside of 18fpe with no further mods. If you want (and can legally have) more power, get Rich to supply a better spring too. Prices on his website.
Walther CP-2 Match, FAS 604 & Tau 7 target pistols, Smith & Wesson 6" & 4" co2 pistol, Crosman 1377,
Baikal IZH 53 pistol, Gamo CFX Royal,177, Umarex SA-10 CO2 pistol.