You don't need to, more doesn't always mean better results. Plus, if you have never ran any of the products first, you want to run said product solo before staking so you can see how and if it is effecting you.
If you are dead set on adding one, AlphaMax is great. AlphaMax is more than just a test booster, it is a complete natural anabolic. For example, Forskolin increases testosterone, but I say it's effects on body composition are why people really use it. Tongkat Ali (eurycoma) can reduce cortisol levels, as well as reduce stress and improve mood and libido. Ashwagandha can also reduce cortisol and stress/anxiety, and also increase muscle mass, strength, and endurance. Ferulic acid can improve mass and strength as well. All of the ingredients mentioned above are contained at full doses in AlphaMax (and there are other ingredients as well), so it's much more than a test booster really.