Glamorgan lost their first home match in this year's Vitality Blast competition as Gloucestershire secured a five-wicket win at Sophia Gardens.
Captain David Lloyd top scored for Glamorgan with 68 off 43 balls in their 158/8, but they failed to capitalise on a fine start and were under par according to the skipper despite a good bowling performance.
"We were probably 15-20 runs short, we had a really good start but it was quite hard when new batters came in so it needed one of us to go deep and unfortunately we didn't do that," said Lloyd.
"I felt good, I've felt good for every game and it hasn't quite come off but that's T20 cricket. We've been so close every game but haven't put together that perfect performance which we're looking to do.
"There'll be a fresh wicket Friday so we'll see which way to go (with selection), there's still a lot of cricket left in this format and teams who get on a roll can still do it.
"The way the lads (quick bowlers) have gone up top has been superb, Hoges has come back into this format and shown what he's still capable of doing, Neser has been great as well. We saved Prem for the middle and he bowled extremely well but we'll have a look at how we go about things on Friday."