One of the things I feel like I need to grasp more is coffee bean development.
I recently decided to play around with profiles using my SHB El Salvador. I'm using an Ambex YM2, so I turned the damper all the way to the cooling bin, allowing a 50/50 airflow. With a charge temp of 430 and an equilibrium of 160, it is a steady rise to 1st crack at around 9. The roast is a total of 14 minutes.
My dilemma is this, when I crack open the bean, I see the inner and outer part are lighter, while the middle is a little darker. Reason? Maybe I'm approaching 1st crack too fast or going too hard into it? The goal is an even roast through out the bean.
Most roasters are rated for higher batches than their sweet spots.
The slow ramp 6-8min. fast finish 2-2.5min is the Diedrich approach and is talked about here
slow ramp fast finish . They may be talking about it in the IR-12 thread here, also. I did a sumatra roast with it and liked the results. Melded the various sumatra flavors in a nice way. I'd stick to tweaking the faster ramp slower finish with your El Salvador.
I'm gonna try that on Friday. I'm very interested in seeing the results. I was sample roasting some Sumatras on a small air roaster the other day and usually charged the machine with 135 grams of coffee. Taking this discussion into account, I reduced the charge to 115 and the results were staggering. I've never seen such pretty bean development. It almost brought a tear to my eye;)
I've got to say I love Barista Exchange and this forum. Its is awesome to post and have an open exchange of ideas.
I just posted a new discussion to "Roasting" titled "Roaster Mods". I am doing some work on a Samiac 10 and am going to post some of the mods there. Would love to hear your thoughts!