First thing if you want a slow dry is not to trim the fan leaves. Make large cuts instead of individual branches. The more foliage and stalk, the slower the dry time. The stalk and buds will dry at the same speed and fans(leaves) will slow the process even more.
Spend $40 on a couple good usb fans with rheostats. My favorite is a 120mm Thermaltake static pressure computer fan converted to a desk fan. Use indirect flow either over or away from your buds. You can also use a a box or oscillating fan pointed away at a wall or corner using pressure to shift air around the room.
My little Thermaltake fan can be turned down so low it can barely be felt a foot away.
If you're in a cold environment like me and the buds are heavy like my Kush you'll need direct airflow for at least a few days. It would also be a good idea to have a hygrometer/temperature combo with an extension sensor for hanging into the midst of the plants while the display is available to be easily read.
Sativa buds are usually small and somewhat fluffy. It's hard to dry them slowly. Mine dried in 4-5 days with little airflow in 60-70F daytime temps.
I wash my buds in a dilute H2O2 bath right after cutting so they start off wet and I have to use direct airflow the first few hours at least to get rid of surface moisture. I think it helps extend the dry time by the use of the bath but I'm not certain.
I'll post some some pics of my setup. Probably won't be useful to you because I'm drying very dense Kush at around 45F. I'd say optimal drying conditions are around 65F and 48% humidity (just my opinion). I will shift my fans away and to static pressure at around 65-70% room humidity. Then tub them at around 40% room humidity and moniter with my hygro/temp extension. They'll probably jump to the mid 60%s in the tubs and I'll burp and shift them periodically until I'm comfortable they are dry enough to stay static.
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You cant see it but my hygrometer reads 85%, hence the direct fans.