I think I have honed in on a routine to stick to for a while. It typically looks something like this:
(All without porn)
Manual squeezes, often with a cock ring to help with blood flow. Details about my squeezes to follow.
A couple rounds of clamping for 5 or so minutes, a few rounds of releasing the clamp and kegeling to get the clamped expansion up, then starting the clock.
30 min or less of pumping below 5 hg.
More manual squeezes to push expansion farther and reduce edema.
A couple more sets of clamping if my EQ is up to it.
The manual squeezing I do is something like an Uli but for the entire shaft. Start with an ok grip at the base, palm down, partial erection. The key here is that the area at the base should not be so engorged with blood that you can’t completely close it off with your OK grip. Think about something stimulating or use your other hand for stimulation, and kegel in more blood, while you release the OK grip and immediately close it off again. Repeat the process, kegeling and opening the OK grip and then immediately closing. If done right, the area under the OK grip should not increase in size at all and should be able to be completely clamped off with your index finger and thumb while the shaft and head should be at a supernormal size with some good expansion and pressure. At that point, either squeeze harder if possible or just slowly push the OK grip a little bit towards the head to add to the expansion pressure. Best to do this push towards the head gently at first. It takes some conditioning to get used to. I do similar kegel juggling with clamping to get good pressure in the clamp. Release the clamp, kegel in blood, quickly close it again. This is harder to do with a clamp though, because it is hard to quickly close and quickly open, compared to your hand.