I used a Cadence 13' #3 feeder with 1.5oz tip at the weekend - using 30- 50gm black-caps - 6lb mainline and hook-lengths 4lb to 6lb
Sensitive enough in the tip and did hook and land some nice chub to 5-8 but lost a couple of good uns in snags due to the set-up just lacking a bit of grunt to bully a fit, heavy fish in a modest flow. As Mark said strike at everything as bites can be very subtle.
I changed over to a Daiwa Theory 2.25 with a 2oz tip and 10lb line for bread fishing and had some nice fish with big bites, which honestly surprised me. This time I could really apply pressure to get them away from the danger areas but still got a good fight as the chub are in good fettle at the moment. Consequently 3 out of 4 landed with the heavier set up.
And this can be the dilemma IMHO - some days the chub can be very, very finicky and you need to fine right down for bite indication but..if you get a wily old fish in a snaggy swim with good flow it could be a challenge.
Conversely and as happened at the weekend, for a short period they were hanging themselves on big hooks, big baits and cruder rigs.
I had a 9lb mono hooklink snapped like cotton a couple of weeks ago whist fishing an in-line maggot feeder with a short hooklink, such was the ferocity of the take. So you are constantly having to work out what works on the day.
In the right swim most carp feeder rods or heavy match feeder( I have puddle chuckers & a Carbonactive for this too ) can offer great sport on chub
In snaggy swims/ powerful rivers and if fishing specifically for bigger (5lb+) chub I prefer a barbel type rod with a tip - Fox Royales are a nice rod at good money and anything from Drennan will be good. I will eventually get a Theory in 1.75 t/c, simply because the 2.25 is a bit too powerful when the chub is under the rod tip and I end up having to give more clutch than I would like rather than let the rod absorb lunges as they try one last time for that snag under your feet.
Apologies if this doesn't give a definitive answer, but I think I've learnt that you need quite a few approaches if you want to hook and land chub consistently. And I make that distinction because some days you get the hooking bit right, but the landing bit wrong and vice-versa More so than barbel, and we've not talked about float rods.