Silicon seal on uneven tiles problem - Tile Advice

[Vyper39]

View attachment 97254 Hello, I recently did a job with the same tiles and on the vertical joints there is no way to make a neat job of it that i can figure out, I tried a few methods and opted for clear silicone and a soapy finger.
Did you have fun grouting them ?

Likewise! Clear silicone and and soapy finger ... but 3 years on, and re-sealing again, I really wish I had thought of including a narrow margin of flat tiles into the corners.