I had similar problems with the AppExchange from Salesforce. I tried with Octoparse + Browse Ai and they both failed. Their support is tired of me asking for a fix🤣
I tried with Bright Data and got the results i was looking for
Have you tried to run the 5 rows for free before improvement ? I like to use ChatGPT and ask it to improve my prompt for ChatGPT before asking for example output. Takes time but very effective