The Drake records (and ones shot by Brown using Drake's gear) you quote were made with synthetics through and through, including carbon arrows truly the size of knitting needles, whereas the modern records made with materials available to the ancients - the only records we have data for comparison from earlier times - are all well below what was reached by earlier generations. Apples and oranges. When the best bowyers of modern times make the best wood bows and arrows they possibly can and give them to the hands of the best modern archers, the pre-modern records remain untouched. This is really hard for many steeped in modernism to swallow (I am not referring to Chris D.).
It might seem we modern folk have infinitely better resources for achieving what has never been achieved before. And if we're talking about the 100 meters dash or Pro golfing, where huge amounts of money involved make it possible for thousands of people to dedicate their entire waking hours to the task, this surely stands true. But natural-material archery discussed here is nothing but a small fringe niche among dozens of obscure hobbies today.
Almost no-one today can or even want to spend his life crafting wooden bows and arrows and learning how to best use them. Compare this to the times when the bow was the most important long range weapon armies had and people had a very real incentive to get as good with them as possible? How many people today start shooting in the bow at age four, and continue to do this uninterrupted, day in, day out, through their adulthood? How many of us do this under
professional peer-pressure? This difference in attitude, seriousness, focus is something we as casual hobbyists lack compared to the bow-wielding soldiers of the past. Just as we are fumbling fools in the woods, bow in hand, compared to any 18th century Native American hunter crafty enough to have survived into adulthood (scores of ethnographic data on this, unlike on English warbows and their users). Pictures of scrawny, 60kg Lliangulu hunters with 100# elephant bows at full draw come to mind...Think wolves and German shepards - same size, same outward appearance, but the former can shred the latter into pieces without breaking a sweat, despite (or because of!) the shep's more benign childhood, lesser disease and better nutrition.
About bow woods and their modern inferiority: The ring counts and earlywood-latewood ratios of studied MR specimens are decidedly superior to almost all the yew available today, plain and simple. Just as the very best American bow yew was cut down by the ancients
of the 1930's and is nowhere to be found today, I hear. When a bow stave includes 150 years of growth, and maybe one tree in 100 is genetically gifted enough to qualify, things like this happen.
Tuukka