I need to make a ton of dots on a cake, but can't seem to get them perfectly round without a peak of some sort...
I can't either.... ....I wait for the icing to crust the gently press it flat with my finger.
Easy peasy, after about every 10-20 with a very small brush just tap them gently and peak will disappear like magic.
If they do put up any resistance slightly dampen the brush
Ditto! If using buttercream, that is exactly what I do (what mamawrobin does.)
If you want a smooth round dot, you can mix up some color flow and drop some on wax paper to harden. They are easy to peel off of the paper and apply to your cake!
That's the ticket. Depending how many but size doesn't matter. ever 1/4 or 1/3 around the cake -letting them set a bit- dab your finger in water and touch the tops.