No I don't read that in the replies mate, you've got 3.5's, they're fine for all carping and you can chuck a small spod/spomb out with them no worries.
I've got 3.5's wouldn't swap them at all for all my fishing, the spod rod is 4lb+ but I'm chucking medium or large spombs. I use that rod with just a lead on for feature finding just because why not, it's a great caster and has decent feel because it's stiff, it also pulls through weed well being strong and is light and used with a light big reel made for the job.
The only lighter rod I would ever use is a floater in 2.75lb - 3lb, 3lb preferably.
Depends on the waters you fish though I guess.
The only thing to consider is using braid for the feature finding, so having a spare spool of braid for your fishing rod, IF you are going to use it for feature finding and spodding at the beginning of the session. That's if you use mono for fishing.
I don't know if that's helped or made it seem more complicated lol