@Rovertech84I am curious as to how you are having trouble versus Titans, they are not a unit I would consider to be overpowered. The Titan is a natural high end counter to all ground based vehicles which includes the Sandstorm, it however being a heavy anti vehicle unit makes it vulnerable to Missile Squads, Laser Soldiers, Zone Troopers and Jumpjet Troopers. So if you ever see your opponent is starting to spam them send some missile squads at them and watch the enemy Titan cry as it does laughable damage to your anti vehicle soldiers. They are very tanky and that is mainly because they are meant to be a late game heavy anti vehicle unit only which loses to an type of anti vehicle infantry or anti vehicle aircraft. The fact is the Titan is going to beat the Sandstorm as that is working as intended, the Sandstorm easily destroys all other vehicles and aircraft except the Titan and Rockworm which are made to hard counter other late game heavy vehicles.
I also noticed you are saying that you are struggling versus Titans as Nod which to me is rather strange seeing as Nod has one of the best Tech Lab late game anti vehicle and anti air unit being the Nod Cyborgs which do heavy damage to any vehicle and aircraft while also slowing its movement speed and attack speed. I can guess that perhaps you don't have this unit in which case throw Laser Soldiers at it and they should do the job but avoid using any other vehicle as it will reduce it to scrap metal within one or two hits. Another strong counter to the GDI Titan if you have it is the Nod Rockworm which can destroy the Titan within one or two hits while it can survive around 3 hits of Titan's Railgun.
Another tip is that perhaps if your enemy is fielding lots of Titans then you are not disrupting their economy enough as Titans are one of the more expensive units in the game at 130 Tiberium with the only unit being more expensive being the GDI Mammoth Tank at 160 Tiberium. It could also be that perhaps the enemy is targeting your economy early by eliminating your harvesters which would allow them to tech into these units faster than normal.