Its all good. Everything you're describing is perfectly normal. The beer will have a little bit of carbonation before bottling. This is from the CO2 that the yeast produce. As for the FG's......I wouldn't go too crazy watching that like a hawk. Recommended FG's are just a guideline. A couple points either way is fine. Plus, you don't want the beer sitting on the trub too long or you risk off flavors. However, generally speaking, the darker the beer and or higher the gravity the longer you should let it age before bottling. But you would age this beer in a secondary fermenter not in the primary. Just leave the beer alone until time to bottle unless there is something crazy going on like a sudden halt in fermentation during primary. The more times you check your gravity.....the greater the chance of contamination. I would just let it go until bottling time and then check the gravity. However, if you absolutely must, go ahead and check the gravity before bottling and add more yeast if you feel you need to to bring down the gravity.
When checking the gravity, it is a good idea to shake it up and get all the corbonation out. The head can be dealt with. I take a paper towel and tear it into small peices and soak up the head. You just don't want bubbles sticking to your hydrometer because that will throw off the reading.
As for the bubbles comming up from the bottom.....those are normal too and that is the CO2 being produced by yeast at the bottom of the fermenter.
Hope this helps.....if you have anymore specific questions let me know