Reapers are hot as hell but they last way way to long. Jigsaws are a punch in the face and leave you endorphin rushed. I don’t understand why the pain can be at diff points or why some shoots really high or some builds and why some lasts so long and some subsides in 10 to 20 minutes.
I don't understand it either, why some have a gentle 'build', and still others start and end hot.
I don't think that the scoville unit applies to that kind of heat, but I know what you mean.
I know that the degree of hotness depends on the cultivar, genetic breeding, available nutrients, available water and sunlight while growing, etc.
A fully mature hot pepper will start 'corking' ( a brown patch forming on the exterior skin), so it tells you when it is ripe.
The novice gardener generally believes that this 'corking' occurs as a form of sunburn, whereas it actually is the plant stating that it is fully ripe.
Yes, I have had oriental hot peppers that have a 'build', whereas ,to me, Spanish and South American peppers seem hot from beginning to end. I don't know why .