Hi John,
Was it you who posted about this before?
I've done the trigger mod, and am in the process of doing the spring adjuster..... I'll let you know how I get on.
Can't honestly see a reason to do the power mod as it's only a target pistol, don't need the extra IMO.
Air Arms S400 Classic - Hawke Airmax 3-9x40 AO MAP6, SMK QB78 DL - JSR 4x40 Mildot ill.El Gamo ASI sniper, BSA Airsporter MkVI. UBC#22 - Sheridan EB22, Gamo Compact:R77-4:Falcon, Walther PPK, CP88 shiney, SMK G10, Baikal 53M:MAK, Crosman 357