After reading everything that the internet has to offer for the past two weeks, I've given in and I'm asking for help. I recently noticed that my mid 2000's Fender Mexican P-Bass was producing extreme volume spikes, especially on A's and C#'s on all 4 strings. They sound very boomy compared with adjacent notes; at least 3 times the volume. When playing live I have to make a conscious effort to play those notes extra soft, even so they are still somehow louder. It is the same on both my practice amp, which is a tiny 25 W Crate, and my larger rig, a Fender Rumble 350 W, which I play in two completely different rooms with different size/shape/flooring, not to mention live venues both indoor and outdoor. Thus, if it's not the amp or the room, it must be the bass. Considering the same notes are over amplified across all the strings, I assume it's not them. (Pyramid flat wounds, I know these have some eccentric qualities so I'm not ruling them out completely, but I don't think they're the culprit). I'm guessing it must be either the Pickups or the Preamp, maybe even the body of the bass. Does anyone have any prior knowledge regarding this issue, or have any suggestions for further pinpointing the cause of this? Also wondering if maybe a compressor pedal would help with this?