Richie Barker surveyed more dropped points from winning positions and insisted: We should have at least six more.
Liam Sercombe netted three minutes into stoppage time to secure a 1-1 draw for Exeter on Saturday.
It was a heart-breaking end for Pompey who had led through Jake Jervis’ ninth-minute opener.
During Barker’s reign they have also slipped to a 2-1 defeat at Southend in time added on – and twice surrendered the lead at Morecambe.
And the Blues boss was left cursing the failure of his team to keep hold of their advantages.
He said: ‘We should be at least half a dozen points better off.
‘But you don’t get a lot for “should”.
‘For that Exeter goal Dan (Alfei) went to get the ball because he thought it was our throw-in which meant he ended up being out of his position and they took the throw-in pretty quickly.
‘A couple of people have not tracked their runners, which was disappointing because it is something we have spoken about before the game and it took a deflection.
‘Obviously we are disappointed but at the minute that seems to be the way it’s going for us,
‘We looked more dangerous than we had been for a while.
‘We worked on certain things throughout the week and they have taken it on board and looked good.
‘Ryan Taylor had a chance at the end and 2-0 would have probably dampened Exeter’s enthusiasm a little bit.
‘But it’s not meant to be.
‘Unfortunately our mistakes get punished and we don’t seem to be able to finish teams off at the other end.
‘It’s two points dropped and you could argue really that sometimes you are better conceding one where you lose the game in the last minute because you’ve only dropped a point.
‘But obviously it would have made a big difference to us.
‘On a positive, that is two defeats in nine, four unbeaten on the road, so there is progression there to see.
‘Would we have taken it before the game? Possibly – but in terms of the manner it came then definitely not.
‘The players were gutted and we have got to pick them up and crack on with it.’
Pompey have now slipped to 19th spot, four points off the drop zone.
– NEIL ALLEN