I have never been a wood foiler.
I prefer to ramp-up the temperature. So, I run at 150 for two heat cycles, which is usually around 45 minutes or so give/take. After I see the second temp decline go down about 5 degrees or so, it turn it up to my final smoking temp.
I don't always watch the heat cycles that closely since I have found that 45 minutes pretty much always works.
To understand why this works, it is important to understand why we sometimes get combustion. This happens by a combination of dry wood and the constant always on element pumping away until the smoker hits its set temperature. So, this is just pounding away full heat on the wood for 15-30 minutes or so depending on what temp you are smoking at.
The reason the ramp-up works is that just as the wood starts to get to the point that it will combust, the element shuts off and gives the wood a break from that constant on element. Then, when the element turns on again the wood has already had some heat and isn't as affected by the new heat cycle.
The foiling works in a similar way in that it prevents the full blast of the element from affecting the wood even though it doesn't give it a break until after it hits the desired temp.
I think both methods are pretty effective. I just can't bring myself to foil my wood. I don't know why.
If you still have trouble with combustion when using either of these methods, try combining them and immediately go to your computer or phone and call Smokinlicious to order some double fillet.