teams that live and die by the 3 are very hard to push to low % chances of winning, for any team. they are going to win at least 5-10% of games against any d3 team, and your guards dont look particularly defense oriented (not bad by any means just doesnt strike me as great, although i havent played d3 in many years), so i dont think its terribly surprising. the other team, as others have said, is really not that bad. you clearly would win that game most of the time, but upsets happen, just have to chalk it up to that.
im not really sure why you'd run uptempo there, but im not sold that you both running uptempo really plays into the other teams strategy. to me the biggest thing is your starters are solid, but your backups are very beatable, dont think you did yourself a favor there (but i dont think it has as much to do with the other team, as with your own)