Stingray 5ers have been my 5ers of reference for 20 years, due to 4 main factors: unparalleled playability mostly due to having the best 5er neck ever, aggressive and focused mix owning tone, amazingly rich and resonant sound, awesome low B. IME no Fender can resonate like an EBMM does, much less have a low B that's remotely close (except maybe the Roscoe Beck Jazz V, then again, still not comparable to SR5s in other depts). A others have mentioned, one of the most important facts about that resonance and low B tightness is stiffness. Besides wood choice, the 6 screw and increased contact patch in the neck joint of a SR5 (often overlooked) is most probably one big cause. Makes for a stiffer platform for the strings to vibrate on, thus your more tense sensation. If said platform is less stable you not only hear that dull sound from the strings but you also can definitely feel that flabbyness in your plucking/picking.
I might be seeing where the OP is coming from. I've been looking for viable Fender-ish sounding alternatives to my Ray 5ers for a decade. Problem being I don't like how Fenders play, their necks, their horrid QC, etc. So I owned many sucedanes, both cheaper and more expensive. Most 5ers don't play remotely like it, many have chunky necks or a too wide string spacing (I'm set on the SR5's 17.5mm), most wouldn't cut in a mix, some would have a terrible low B, or would simply sound like I put a blanket on the amp compared to SR5s. I even had a Sterling5 HS which both wasn't good enough at the Fender-ish game and also sounded thin at the strictly Musicman tone game. Currently I own an indo Yamaha BB-615 (P+J pickups, 3 band active) and a MIK Ibanez ATK-405 (MM+J pickups, 3 band active). Both have super thin necks and play/feel VERY alike my Stingray5s (the BB by virtue of a ramp in between pickups so I can pluck in the MM position), both are solvent at P and Jazz tones, but have more oomph and overal authority plus a better low B than Fenders (on the aggressive side, the BB sounding more classic and the ATK being more hi-fi/modern).
Wanna get frustrated about all 5ers? Get a Stingray5.