You'll be fine on boil, It's difficult getting a full rolling boil on a stove top. as for the particles this is normal... It's what we call hot break. it's just proteins from the extract. it's a good thing. this will produce a clearer final product. sounds like you got your boil hot enough to cause this. good job!
Yankee Sand Flea on a Southern Beach.
Son, you are a walking violation of the laws of nature, but youre lucky, we don't enforce them laws.