The Warriors' impressive start seems a distant memory as defeats to the Dragons, Connacht and most recently Munster have left the side just two places from the foot of the Magners League table.
"It was just a little bit too easy for Munster," said Gregor of the 43-29 defeat at Firhill.
"We have to get a bit more mongrel in us to show teams that they aren't going to cross our line. I think it's coming, though.
"We are a bit of a new team, which I know is a bit of a cop-out, but you're seeing the intensity rising week on week now."
The 29-year-old is currently the leading points scorer at Firhill and believe he is benefiting from increased game time.
"I'm delighted to be given a run in the team but you can't be happy if the team is losing," added Gregor in The Scotsman.
"And it's the players that are at fault for the mistakes out on the pitch, not the coaches, so we have to look to get it sorted.
John Barclay will captain an unchanged Warriors side against Ulster tonight, with Gregor looking forward to the challenge of playing at one of the most talked-about venues in the Magners League.
"Ravenhill has that old-school sort of atmosphere with the man on the mic getting the chants going to intimidate the opposition, but that creates a good atmosphere."
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