V carve bit will cut to the widest point of your letters, so if letters are say 10 mm wide a 60 degree v bit #302 will cut approx. 8.5 mm deep to get this cut done.
Wider v bits can cut letters without going as deep to touch both sides of letters.
You could try offsetting your text to create a thinner path for the v bit to carve, will have much more detail.
Without the file I can’t me much help other than that, converting your image to svg leaves many things changed in conversion. So further processing that won’t be of much help as my image size could be off by a few mm or a few inches, which wouldn’t help you with the fine details.
If you can send file, Ill work on it to get the best possible outcome, I’m in my shop running jobs for clients so I have idle time while the machine does its thing. It’s up to you