Opening your smoker to check temps isnt a bad thing to do. It isnt like a souflee that will collapse, it is a hunk of meat that is smoking.
Check the temps all around the fatty. Another thing you can do is just wait till the bacon is crispy and the rest should be done.
*Weber Mini WSM* *Weber Touch and Go Performer X3* *Sublime Smoke UDS* *Maverick ET-732 * World's Fastest Blue Thermapen **Pitmaster IQ110*