I can't read your HOA agreement from here either.
But the key to it is probably flying under the radar. I live in an early planned unit development with an HOA dating from 1962. Home based businesses are permitted but strictly limited. We have several which would probably not pass but no one seems to be inconvenienced. It's the increase in traffic and noise which will get someone to gin it up with the HOA. I can't believe you are attracting much attention with a computer drafting business.
As a surveyor and user of Autocad and Microstation, I would say that you are worrying about a problem you don't have. Are you slowing down the internet access in your neighborhood ?.

.
