If your joints ache like mad then you are liekly icnreaisng millage to fast, which you liekly are because you are increasing your miles by 1 mile a week. That isn't a big increase but you aren't giving time for your body to adapt. You should hold the increased millage for about 3 weeks before increasing again. It takes time to get to higher miles.
the other thing is as i said in previous posts, keep your speed down. You say you are doing your miles in a good time which is a red flag to me. A beginner mistake that I fell foul of was to always try to run hard and look for increase paces week on week. If you are increasing your millage AND increasing pace then your injury risk is much higher, your sore joints are a warning.
Sore muscles is one thing, that is actually a good sign that you had a hard work out, as is feeling shattered, but joint pain is a bad sign.
Make sure when you are running you can easily hold a conversation without labored breathing. If you run by yourself talk to yourself but loud for a minute every so often or sing, o get your phone out and call someone o you don't look weird. Faster running has benefits, but much less than you would think and the benefits can be seen much later in training. Beyond increasing your injury risk, fast running is also simply not effective training for a half or whole marathon, see my above posts.
It is something really hard to get used to, it feels awkward to run that slow, I frequently fail to follow my own advice, and often feel the consequences.
My normal route is a mix of flat, down and a nasty hill over a 3 mile distance, which I repeat.
good work.
