I use a 12ft 3.25 rod for my marker and it doubles as my spod rod on large waters, It’s a old rod with a tippy action you could say it’s a freak of a rod light in hand and wafer thin and can handle medium spods easily iv used it at 24 wraps using braid on the reel.
On your water the rods you got would handle a medium spod easily 👍as long as your line is not to thin in diameter
The water I’m on at the mo I use 10ft 3.50 rods 35mm mono line on the reels and I can tell when I’m on silt or hard clay but using braided line is better. I also spod with my rods
Good luck catching your 20lb plus Carp 🤞…let us know how you get on 👍