Marske dropped two more points at home to Belper Town yesterday, Jarrett said:
"Two points dropped, completely dominated the game, they had about four chances in the whole match.
"We spoke this week about our Achilles heel which is set pieces and it's killing us.
"From our side of things it's frustrating, we dominated the game chances wise but it's same old.
"You can't keep coming across teams in this league because you have to be more ruthless in both boxes.
"Their management team couldn't wait for the final whistle to go which is frustrating for me because you know your team has played well.
"I personally think we should have scored at least another three goals today and it's two points dropped."
Set-pieces has proved a major problem for The Seasiders all season, costing them 27 points to date.
Marske have lost seven games by one goal due to conceding a set-piece this season, Carl said:
"The lads just need to show a bit more desire to win the ball. We mixed our set plays up a bit today to try and get the ball in different areas.
"You can't go zonal at this level because no one knows what they're doing, so it's man-on-man.
"All you need to do is not get beat by your man and at the present minute we seem to be second best to every ball in the box. "
Updated 15:23 - 3 Mar 2019 by Joe Robertson