I have a s270 mol too just like you and unfortunantely the same happened to me,the guitar wouldn't stay in tume,so what i did was change that tremolo system for another ibanez one,the lo-trs that is cheap and now its double locked.the guitar never lost tune again,the tremelo stabiliser will not work because the string its still inside the back tremolo screw loose,so its no point even if you dont use the tremolo but you bend a string it will still detune it.after changing the tremolo what i did to the pickups was throw them to the garbage!they are horrible,in the bridge i put a dimarzio air norton,in the neck a paf pro and in the middle a seymour duncan little 59' humbucker,before i couldn't use the middle pickup because it would start humming like crazy now its quiet like hell plus i took all the sponge protectors under the middle pickupabd just put a little thin one and screw it with 2 smaller screws (half inch or 1,5 cm) otherwise they will come out inside the back cavity next to the springs,now the pickup its very low but because its a humbucker as well like the others the intensity of sound its allmost the same plus the little 59 all the pickup poles its screws so you can put them even lower or higher,if it was a single pickup you would really notice a big diference in sound ...i hope this helps!