You can tweak it by editing the content.json file. If you edit the file while in-game, you can save it and press F5 in-game to reload the file.
Technical
Requires Content Patcher and Dialogue Display Framework.
If you want to complain or ask for help or help me test my mods, you can visit my Discord server.
A list of all my mods for Stardew Valley is available at https://www.nexusmods.com/stardewvalley/articles/895.