Fillipino is not as powerful as people think...this is a rather slender, tall eagle, equiped with longer legs , but weak talons compared with those of harpy and crowned.
Just compare the massivity of the toes and size of talons and you will have an accurate image.
Records shows how powerful the Philippine eagle is; by the prey items that had been documented; from a small bat to a 30 lb deer at a nest studied by Dr. Robert Kennedy; yes colugos are the prefered prey item in Mindanao maybe becoz they are easy prey, (nocturnal mammals) inactive during the day and the eagle knows where and how to get them also a nice size for a meal 1.5-2 kg but that's the eagles in Mindanao region which the colugos or flying lemurs can only be found.
Excert from the source: Threatened Birds of Asia
The structure of the eagle (its goshawk-like appearance) is an adaptation to allow high maneuverability during sudden rapid attack, but the species frequently soars and is rarely seen in flapping flight (Kennedy 1977); however, in what was then thought the first direct observation of an eagle hunting, a bird was observed (at 10h40) “in a hard-flapping flight through the canopy of trees and crashed into the TREE CROWNS and aerial epiphytic plants [during] 8 short flights... the quick twists and turns of its head and rapid flight style [indicating its] purposeful intensity” (PECP Fourth Quarter Report 1987)(this account suggests that the bird may have been attempting to flush prey by noisily “attacking” certain forest features either themselves likely to contain an
appropriate animal or, by virtue of the disturbance, so as to induce panic and movement in nearby unseen animals). Rapid pursuit is not, however, the only hunting method: Kennedy
(1981c) claimed to have discovered why the species has such long legs, and how it manages to
exploit such strictly nocturnal mammals as flying lemurs,
Studies of flying lemurs nevertheless suggest that they generally roost in the crowns of trees and are presumably caught there (N. R. Ingle in litt. 1997). Birds are reported to hunt both singly and in pairs, in the latter case apparently when targeting monkeys (Kennedy 1977).
http://en.allexperts.com/q/Wild-Animals-705/Philippine-Eagle.htm
http://en.allexperts.com/q/Wild-Animals-705/f_4626883.htm
The Philippine eagles in Luzon has different diet regime like large snakes such as cobra and pythons, deer, monitor lizads, civets, large birds like hornbills, small dog and pigs and it's fave prey monkeys-there is only one monkey species in the Philippines, the Philippine long-tailed macaques and weighs 4 to 6 kg up to 9 kg for males and are one of the most challenging prey the'ye agile and elusive as compares to sloth and small monkey (especially genus-Chlorocebus) which the Harpy and the crown eagles hunt.
Source:
http://birdbase.hokkaido-ies.go.jp/rdb/rdb_en/pithjeff.pdf
(ECOLOGY pp14-16)
By these prey items I can safely say that no one can consider the Philippine eagle as "weak talons" as you have quoted...
The African crowned eagle can take large prey but it can only lift up to its own body weight with a wingspan
of no more than 6 feet there's no way it can lift 6 - 10 kg weight of prey; Crowned eagles - Length is 80-95 cm (32-38 in), the wingspan is 1.5-2.1m (5-7 ft) and body weight is 3.2-4.1 kg (7-9.1 lbs).
Take a look at this youtube footage of a crowned eagle taking a small monkey, it can barely fly with a 1-2.5 kg of prey granting that the eagle is a male.
http://www.youtube.com/watch?v=v9ENY2ujNUE