My Gauls are finding it difficult this last while. My warbands can't seem to stand up to the legionary blades, even with support. My psiloi spend most of their time recoiling or fleeing. Any hints as to how to get the best out of Celts?
I think there are a couple of useful things to consider, learnt from my son. Consider the aggression, a low aggression post Telemon can be used to ensure you select terrain. Further, try using a dismounted Wb general on occasion. It greatly increases the chance of a breakthrough when fighting those Romans.
One local has played a couple of games using Galatians, having enough Celts to form both. I dislike his scythed chariot, it can cause havoc to my lines on occasion, though can be countered by light troops.
Strelnkov has put on some very entertaining big battle historical refights with Romans and Gauls. They have been pretty balanced in overall results if the individual games might have been a bit one sided. If Gauls can break through it can get pretty tough for the Romans. His scenarios have also had a number of adjustments (e.g. 10th Legion does not have to pursue.)
I find the Gauls with 3xCv, 1xPs, 6x4Wb, 2x3Wb can give the Romans a hell of a time. BTW, I can't find anything about solid vs fast not providing each other with support, so you could have multiple configurations of the 4 and 3 Wb elements. I find the Romans have a hard time once a single Bd has been punched out of the line. And the Cv can tie up the Bd nicely, shaving off flank elements, reducing the overlaps the Romans might otherwise enjoy...