RE: G5 meta peep
In the case of some of the custom strings with much higher twists per inch, pressureis greatly increased on the peep to the tune of less than 1" as previously noted. To achieve 1" clearance on each side of a peep you'd have to untwist some strings - NOT. Aluminum peeps like Tru-Peep and Radical don't have these problems.
Peep manufacturers also have to be aware of these more intense twist rates and their subsequent tighter angles on the sides of the peep. Therefore they have to make sure the peeps don't present sharp edges to the strands and which can cut string strands and eventually cause strings to break at the peep location. We've already seen this happen.