Blackdog, IMHO techniques from the huge pits of an Aaron Franklin don't always translate directly to backyard offsets. Given the size of his fire and the volume/speed of his airflow/smoke flow thru the smoker, for example, I can understand how and why he keeps his door wide open for air input, but that approach might not work so well on smaller thinner smokers.
So on your next cook, for example, you might try closing the door and using the air intake controls instead. Make sure the exhaust is wide open at all times. Use smaller splits more frequently. Many folks lay down an initial coal bed from lump, but I actually prefer briquettes because I find the coals will last longer until more coals develop from the wood, giving more consistency to the coal bed. As Smitty says, play with it and you'll soon get it how you want. It's not rocket science.
Although I totally understand wanting to play with a cheaper offset before making a bigger investment, I will say I really do believe an offset smoker is one device where it can be much trickier and more difficult to control a cheap version made with thin, light metal and a worse design. Whereas it can be much easier and less time/effort dependent to control a quality, well-designed, 3/16ths or thicker version. I predict your enjoyment and relaxation will improve significantly if you make the move sooner rather than later.
Otherwise, I echo the others who suggest not getting too tied up about the temp's. Those like me who were smokin with offsets 30 years ago didn't have anything other than one cheap bimetal thermometer installed in the cook chamber. We didn't know about any end-to-end or top-to-bottom temp variations in the cook chamber; I never had tuning plates; we monitored the pit by lookin at the round dial every half hour for 12+ hours and went for an average temp of 225. And the briskets came out SPECTACULARLY. So use the technology to make things easier, more convenient, and maybe a bit better, but don't let the technology control you.