I'm glad to see a positive report on the ELD-X bullets. I bought a 6.5 Creedmoor several months back and the 143's have shot so well I've never bothered to try anything else, probably won't. Like you my concern how well they would perform on game. I've read several positive reports similar to yours. I've been shooting the 178's in my 308 with good accuracy as well.
The ELDX has performed very well for us this year. Three bucks, three shots, 150 out of a 7mm-08. One bull, 3 shots (he was dead after the first, but if he's standing my nephew is shooting), same load.
162 ELDX 7mm Rem Mag, one buck and two elk, three shots. No complaints.
P