The key to beating or competing with Jason's double lancer is to recognize he is going to kill things, and kill things fast. You have to be able to respond, killing the first lancer quickly. Jason knows this too, and that's actually part of the strategy of the squad, the first one is for basic suicide mission, the second cleans up, with the IG as the final nail for most squads. You have to get through all of them quickly to have a chance, and hope you have enough hps left to finish GGDAC and Sid before they get you. So you have to both advance quickly, and defend your pieces. It's a tall order, but the right pieces can do it.
Jason won't make a lot of mistakes with positioning, and will generally make the most of his strikes, so if you make one poor placement, expect it to be exploited. Sora is key in the matchup. He can kill the lancers, but you are going to have to expose your Whorm to do it. You generally have to trade him for one, and trade your mice and damage on the IGs for the other. Then its down to who can finish the other pieces first. The Keldor provides a nice blocker, but I'm not sure its superior to taking a BG. Oddly, the Gammorian may be the best reinforcement, although on the right map, override can be your friend. I'd generally play this squad on Chancellor's starship, as it presents not only safe squares from strafe, but also the ability to slow the lancer advance with the doors. You will have to bait the lancers because they outrange you significantly, so setting up the counter strikes is the key to the matchup.
Not an easy match, but one that the Sora version can compete in, as opposed to Eric's strategy of just losing