[Varyon]

First off, determine if you want infantry to readily take down armored cavalry. If you're making your own setting (and thus aren't stuck with Dragonball's premise when it comes to modern technology - namely, that it's useless against the characters), and you want lower tier ki warriors to not be tank-killers... then don't have alien mooks be tank-killers. Their incredible mobility, highly-accurate weapons, and improved armor technology all give them a huge advantage over TL 8 infantry, and in fact just about anything short of a tank or perhaps an APC will likely fall to them rather quickly. When they need to take out tanks, they either call in their own armor, or they may have some specialists with antitank weaponry. Of course, against a TL 8 tank, you don't need to get that special - a TL 11 thimble grenade with a HEMP warhead does 21d(10) cr inc, which will punch through any part of the tank's armor but the front. Toss a couple as you fly over a tank, and as long as one hits the tank's crew is likely dead or seriously injured.