Why not both? Do an intensive manual stretching routine to begin with, and then finish with at least 3 * 20 minute light hanging sets, probably BTC given your hight LOT, to concrete any temporary gains made from the stretching.
As for what manual stretching you should do - hopefully somebody will chime in on this point as I’m not an expert on which manual stretching exercises are best - you need to focus (most definitely) on LIG stretches since you have a very high LOT (good good).
I found one of the most effective LIG stretches to be lying on my back in a kind of squatting position, if you can imagine that, and pulling your penis between your legs hard. You should combine this, and indeed any LIG strecthes, with Blasters.