The Hornets trailed 1-0 after a first half Still described as “not terrible, not great” before stepping things up considerably after the break.
Othmane Maamma levelled things up before the impressive Baah was hugely influential in their second, teeing up what has gone down as an own goal.
Preston pulled the game back to 2-2 but Watford looked far the likelier to win it, leaving Still satisfied.
He said: “The first half wasn’t so bad – it wasn’t terrible, it wasn’t great.
“It’s a shame we had that one moment where we switched off because apart from that they didn’t have much.
“But I really hope the team has taken a lot of confidence from the second half.
“The speed and tempo that we put into the game, we’ve put them under a lot of pressure. We’ve created enough chances to win that.
“In the end it’s a good point but I’m disappointed for the dressing room that they didn’t get more.
“We wanted to try and stretch the opposition a little bit more in the second half, what we’ve done all week but didn’t manage to do in the first half.
“You saw in the first five or six minutes we played a couple of balls short into midfield, which we didn’t want to do on this pitch. The pitch was really, really difficult.
“That was the message at half-time and why we wanted Baah on the pitch.”
Kwadwo Baah celebrates Watford’s second (Image: Alan Cozzi/Watford FC)
Still explained to Chakvetadze at the break that he wanted more pace and threat in behind, introducing Baah to real effect for the second half.
The winger has featured far less than expected this season, both Paulo Pezzolano and Javi Gracia feeling he didn’t do enough tactically, but proved why supporters want to see far more of him at Deepdale.
Still said: “We had to stretch them.
“Once we did that, we opened up space in midfield to be able to control the game a little bit more.
“Louza got on the ball more, Maamma a little bit more.
“Baah makes things happen. All of us – his team-mates, coaches – we’ve got to get in his head and get that out of him every week, on the training pitch and in games.
“We’ve also got [Nestory] Irankunda coming back next week, so I’ve got to work out how I can get 14 or 15 players on the pitch.
“I said to Giorgi that it’s not nice taking players off and it wasn’t a question of hooking him because he was bad.
“It’s just that we’re there on the bench trying to make the best call for the team and we felt we had the space to open this up, but it wasn’t happening because of the profiles we chose.
“To be able to turn it around and count on Kwadwo to come off the bench is really good for the team.”