The teams went in for half time with the well supported Buckland 0-1 up, but there should surely have been more goals.
The home side came out stronger in the second half with Dan Lean crossing for Tinsley, volleying home an equaliser on the slide.
The next ten minutes were crucial to the outcome of the game.
St Austell had the advantage but couldn’t make the most of it as Buckland showed their quality.
First of all, Lynch grabbed his second goal of the night holding off Lee Whetter to finish strongly.
Soon after, substitute Gavin Hammon slid the ball across Penhaligon and into the back of the St Austell net.
It could have been 1-4 had the remarkable Tom Smith not made a last gasp challenge on Hammon.
The referee was coming in from a lot of stick from players, coaches and fans alike with the mood souring on and off the pitch.
St Austell kept looking for a way back into the game and Lean stung the ‘keepers hands with a fierce drive.
The final whistle blew and it was just one of those days for St Austell who were undone by the class of Buckland, who continue climbing the table.
Had Mike Body’s shot hit the back of the net after he’d rounded the keeper, it could have been all so different.
St Austell chairman James Hutchings had nothing but praise for his players at the final whistle saying: “I thought the lads here tonight played absolutely fantastic, considering the conditions, they put a real good effort in.
“I didn’t think we quite deserved to lose 1-3, we played very well for seventy minutes. In the last twenty we couldn’t keep the rhythm going.”
Tonight marked St Austell’s first game under floodlights at Poltair Park. It drew in a record South West Premier crowd of 556, which beat the previous record by 62 (494 – Buckland Athletic vs. Witheridge).
Mr Hutchings said: “The whole day went brilliant, it was a bit worrying earlier today with all the rain, but thankfully during the game it stayed dry.
“It was touch and go. This morning we had a very tough job marking it, but thanks go out to the guys who worked on the pitch during the day.
“Moving onto the next game, the lads can go into it with their heads held high after putting in a good shift tonight; they’ve done the town and the club proud.”
AFC St Austell are away to Cullompton Rangers next weekend, with Buckland Athletic facing Liskeard Athletic in a mouth-watering tie at Homers Heath.
AFC St Austell: Penhaligon, Lean, Mulready, Whetter, Smith (Godridge), Dingle, Douglas, Campbell, Nancarrow ©, Body (Hartigan), Tinsley (Phillips). Subs Not Used: Wheildon, Hill
Buckland Athletic: Griffiths, Drew, Gaze (Kelly), M Revell, Fisher, Moseley (Stevens), Booth, Lewis ©, Lynch, Wright (Hammon), S Revell Subs Not Used: -