Like I said before; I'm not trying to sound like Sir Paul. I have about as much chance of that, as trying to fly off my roof by flapping my arms...
I have the Optima RB's on my '01 COY Rick 4003, because they're as close as I can come to the sound of the factory Maxima's on the '68 4001 that I learned to play bass on - in 1968... I also had the push/pull treble tone switch - and the factory .047 cap - installed on it, because the '01 4003's didn't come that way...
The Roto TruBass 88 tapes? I have them on my late '90s MIK Rogue VB-100 violin bass - which is comparable in quality to a Hofner 500/1 CT bass (without a center block). They're there because, with them, IMO it sounds like a violin bass is
supposed to sound. And, because of all the strings I tried on the thing, the Roto's were the only ones that tuned up and intonated - perfectly. It's worn the Roto 88's for about 12 years, now...
I also have a '73 Rick 4001, which also has the push/pull treble tone switch installed (the cap was already there). I usually leave it with the cap in the circuit; but I can cut it out, if I ever get a wild hair... Unfortunately, it's begun to develop the neck problems that some older 4001's get - thanks to that @**&#! "Bathtub Rout" up at the neck. So, it wears Dogal JC106A "Jaco" CarbonSteel Flats, instead of the Optima RBs. With an advertised tension of 5 kg. per string (44 lbs. a set; 1/3 the tension of the La Bella LTFF's), they're just what the doctor ordered. And, from the way they came up to pitch almost instantly? I believe them, too. Doesn't hurt that they sound great on the poor old thing, either. Not exactly like the original Maximas, but... pretty close, to my ears.