Davis looked exhilarated as well as shocked by the progress he made in Soul Forging Cultivation. The energy required to increase his Soul Forging Cultivation was many times larger than the norm that it could be considered that the pill should have a pill efficacy reaching the seventh level of the Ninth Stage.
If not, he wouldn't have come to this point, just a tiny bit away from stepping into the Peak-Level Emperor Soul Stage.
Unfortunately, he didn't have a better pill recipe to concoct and make use of. Otherwise, the karmic bestowal could be made better use of, and fortunately, he didn't try using the Supreme Ebbing Sigil Pill as the guinea pig. If not, he wouldn't have known about the pill tribulation's might and let it face it, possibly having it destroyed by the heavenly lightning.