I have a very difficult paint to match (Mustang Cobra with Mystichrome color shifting metallic paint) and have had these same tiny pin-head sized chips. I do have a 3M clear bra covering many panels already, BTW. Chips can still happen other places.
I have had good results with factory touch up paint, a #00 paint brush, and Langka. The Langka chip repair kit is a kind of polish that you use to level off your touch-up paint blob and remove excess paint from around the area you wanted to fill. The result is that the white chip mark is gone and you have filled it up with matching paint that isn't slopped above and outside of the area you wanted to cover.
The process takes a little time, but no worse than trying to polish out swirls. You very gently fill in the chip with your fine #00 or #0 paint brush. (I got mine at a craft store, you can probably find them at a shop that sells model airplanes and trains too.) Allow the paint to dry for several hours or overnight. Then you rub on the dried paint blob with the Langka until it is polished smooth and the excess paint is gone.
The first few times I tried this technique, I kept removing all of the touch-up paint and had to start all over again. The good news is that if you screw up, you can remove the paint with Langka and have a re-do. You rub just enough to take off most of the blob, a teeny tiny bit of excess may still remain, but you will never notice it from more than 12" away.
The result is that no one else can see whitespots or ugly touch-up paint marks on your car and the color is matched very well. Most of the time, I can't even find the touch-up spots even when I am standing near the car, they are so well matched. I only see them when waxing and my face is right up next to the paint.
I thought that with metallic color-shifting paint it would never match, but it does. The color shifts on the touch-up spots match the rest of the panel and are of the same shade. I have to imagine that you can achieve similar results on silver with a little bit of patience and a deft touch with the brush.
The one thing I never got filled in was a tiny 2" scratch. I could not get the paint to stay in the scratch mark after rubbing with Langka. The Langka just kept pulling the touch-up paint off because the scratch was so thin and it didn't fill up with much paint. I think it requires a much more steady hand and gentle touch to do fine scratches than it does for tiny rock chips.