The biggest factor in how strong/concentrated your kief is will be your starting material. That could be anywhere from 20-60%, it's typically going to fall in the 40-50% THC range. but you're extracting more than just THC, terpenes and cannabinoids besides THC are being extracted and the mix of cannabinoids is more important ime than strictly THC levels. You can smoke a 18% THC bud and it can get you higher or have more body effects than something with 25% THC. Kief is easy to extract and mix, so when you mix multiple strains together you're getting a mix of cannabinoids from various strains and you're more likely to get benefits.
Regardless of the starting material or how strong the kief may be, you can control the dosage in mg by how much kief you use in the caps recipe. e.g. The recipe I've posted before (attached) has instructions to make 100mg caps based on 3 tspsns. of coconut oil and 2.3g of kief, making ~21 caps. You divide 2.3g by 21 caps = 109mg. If you want to double up the dose you'd use 4.6g of kief and leave everything else the same to produce 200mg caps.
In your case your tolerance seems to be fairly high, if you adjust your dosage (more or less kief in the same amount of coconut oil) you could make 75mg caps and take 1, then 2, even 3 to test your tolerance the first time, then make the next batch at whatever dosage makes sense for you. I typically make 75's and take those nightly. If I want to get blasted I take 2 of those and I'm waking up still a little cloudy 10 hours later. My GF on the other hand doesn't smoke and has a low tolerance, my 75's will send her flying for 12 hours so I make 25's for her which just acts as a sleeping pill and barely gets her "high" which is what she doesn't like (why she doesn't smoke, she gets too paranoid when she gets high). But it puts her to sleep like a baby after 3-4 hours.