Try this trick, we often fish jigs as light as 1/80th oz during winter.After experimenting with several floats what seems to be the best for light biters is a small weighted round float. The float has a lead weight around the very bottom end , just above where the line is clamped in. The trick is the put the float on your line "upside down". Typically the weighted portion would be down closest to the jig but with this rig put the weighted portion up and clip the unweighted portion down. when you cast it, the float will come to rest weight down which leaves the portion of line connected to the jig sticking up. When a fish applies any pressure at all the float must rotate before it can go under. We use orange and white floats and the color change of the float that occurs when it rotates is easy to see. The light biters also make it rotate as the take weight off of the setup and it rotates up. The up bite is much more subtle but with a little practice you can learn to identify it. The key is to get the smallest float that you are able to see. The weighted feature of the float also allows for longer casts and less wind resistance. Longer rods help with casting distance also. I often fish this set up on 8-8 1/2 foot rods. Hope this makes sense.I forgot to add that maximum line weight for us in winter is 4 lb test and lots of days I will fish 2 lb test. Line weight makes a big difference.