Trac light / vsc

I have a 2010 tundra 4x4 with 150k on it and just had new tires put on firestone destination mt2 295/70/18s and now I have noticed when I'm wot the power is there and the truck is pulling and then around 5k rpm the power is reduced and comes back also half the time I am wot the traction control light comes on but the tires are not spinning and power is reduced as its supposed to. Why am I losing power and why is my traction control light coming on when I'm not spinning? Note I had the same size tires previously but they were a a/t and also I don't notice the issue with nannies turned off completely.

 

Don't see one about just a blinking trac light, I am going to do a zpc on it this week