Bo,
I'd like to understand what you explained, here perhaps my understanding of english just isn't sufficient.
The first part is that you suggest to carefully paint with a small brush the items around the letters in the original tire color, without touching the letters. The second the pin wash isn't completely clear to me. You suggest I guess to put a wash (in small tiny quantities with a small brush) in such a way that the wash stays in between the letters, but doesn't shadow the whites on top? I could give that a try. The only problem I organised for myself is that I have almost completed the aircraft, so I'll have to find a way to support it on the side, while the pin wash dries on the tires. But I want to try, because with my unsuccesfull attempts of dry brushing I did discover what was written and I just liked how it looked on the model. On pictures if the real thing I have never seen anything written on the tires though.
I was also thinking of another technique which bears some resemblance to what you have been doing on your Albatros D.V. Meaning applying different coats of paint and carefully rubbing the top layer off again at some areas with steel wool.
What I am considering is painting the area with the texts white, give it ample time for drying and cover it with the tire color. Then carefully scraping of the paint on the letters, just removing the top coat of paint. It will be tricky because the letters aren't flat but curved around the tire.
I apply a similar technique on PE number plates for railway engines:

These are number plates for NS steam engines. They are about 4mm wide and 2mm high. Still you can read
Nederlandsche above and
Spoorwegen below the number. Here the producer forgot the "n" under Spoorwegen in the 1382 number plate, so he promised me a new set.
But these arrive as PE like this:

You then spray the number plates black and after it has dried there are at least 3 techniques to remove the paint from the numbers and letters. The most used is to sand it with waterproof sanding paper grade 1000, but that leaves tiny scrape marks. Another is to carefully scratch the plate with an Exacto knife perpendicular to the plate, but then sometimes you remove too much paint. What I like most is to moisten a small piece of paper with white spirit, put the plates face down on this paper and move them carefully with only the pressure of your finger over the wet paper. Then my first picture is the result.
regards,
Ivo