There are plenty of red (and "reddish") flags here. For one thing, testing out of that part of the world is notoriously unreliable -- there is a strong tendency for lamps to "pass" when they should fail...because the test lab feels loyalty to whoever paid for the test, because there's a connection between the test lab and the maker of the lamp (or just because the lab wants to keep getting business from that maker or that customer)...because lab practices and equipment are not what they should be...because the requirements are not correctly understood or applied. This doesn't happen all the time/every time, but it does happen frequently enough that responsible companies have full testing done by reputable labs with a track record of providing legitimate test results even when that means telling a maker or customer that the device fails.
Speaking of "full testing": the linked tests are very far from complete. There are whole categories of test missing: water and dirt ingress resistance. Vibration resistance. Thermal cycling tolerance. Lens durability (resistance to chemical attack, physical abrasion, ultraviolet exposure, etc). Basically all the tests that show if the lamps will be piles of fallen-apart junk in a year or two. Those tests are important with prices like you're talking about spending.
(0.6D, 1.3R) is one of many test points in the low beam pattern. It is not appropriate or realistic to try to judge whole beam patterns by comparing the intensity at one single test point. Looking at these incomplete tests and assuming (for the sake of argument) that they're legitimate: the LED headlamps' performance looks OK, not awesome and not awful. It's easy to get stars in your eyes because "Oooh, cool, all the newest cars have LED headlamps, they must be better", and there's plenty of marketing efforts to set that hook and reel in your money. But the fact is there are good, bad, and mediocre headlamps of every possible description. Some halogen headlamps are better than some LED headlamps, many (but not all) HID headlamps are better than many (but not all) halogen headlamps, some LED headlamps are better than certain HID headlamps and vice versa, etc. Morimoto's stuff does not have the track record you seem to perceive in terms of its (real) quality and (real) performance. It has gradually been improving, but it still has a pretty long ways to go. These units you're considering will be largely outperformed in any/all realistic terms by a new set of the stock GM headlamps with their HID low beams and halogen high beams (whoever told you you have halogen low beams as standard equipment was not telling the truth). And the performance advantage of the stock lamps will grow even larger with a set of upgraded low beam bulbs (
these). And, very consistently, the durability and build quality of the GM lamps is far superior to the aftermarket units, too.
Whichever headlamps you wind up choosing, it is crucially important that they must be aimed correctly and carefully using an optical aiming machine (looks like a scope or big video camera that gets placed in front of one lamp at a time) -- NOT with a "shine on the wall" type of method, which is a loose approximation at best.