S42 medium reds yes, which I can get from local brick and mortar here in Helsinki, Finland

. I'm coming from guts via Evah weichs to this point, which both deliver pronounced low end pizz tone. I'm not newbie to Spiros, I've tried several mix and matches with them in the past, most lately I used a mittel E with Evah weichs. Anyway, my primary need for pizz tone is rather thump than contemporary jazz pizz tone, I don't play jazz on the DB. Most of my pizz playing happens in folk / americana / roots music environment, mostly fully acoustic. Lots of busking too. I hear and I'm halfway sure that the thump is there, but I have to learn to dig it out first, and it can be painful at times. Also, my Spiros are a mix of new and very slightly used strings.
My needs have changed a lot during the past year or so. At first, I'm teaching my original first instrument, the drumset nowadays, and I absolutely needed lots of drum gear for this reason. I needed to get rid of extra percussion stuff and electric basses that I don't need to finance the drum gear. I now have my DB, my Fender P, my custom tube pre and beatiful stash of drum stuff. All simple, elegant, practical and reasonable quality that will not get old fashioned, and which can take the hazards of lugging between rooms and two rehearsing spots.
All that said, I like Evahs for pizz a lot, but they're not too great under the bow on my bass, and they are pretty fragile, they can' t take the BS of my car free muscle power lugging lifestyle too well. I have to keep up maintaining three instruments that I study, play and partly use in my teaching now. I can't afford changing strings on the DB once or twice a year, I need longevity and durability.
To the tonal qualities, for me and my needs Spiros are the best arco string in the market, there's no BS in them. What I do or fail doing will respond back immediately. There's clarity like no other. Their natural quality when striving for clean tone reminds me of brass and horns, whereas guts sound like reeds. When not going for clean tone ther' s all possible colours available. I believe this to be true for pizz too, but I'm very much in the beginning learning how to handle all the tonal information available. Let' see how it goes, will report back like I wrote earlier

.