Reducing the Contract sell impact & Buy/Sell taxes

I'm using a Contract that collects and sells tokens at a particular time for generating the taxes - here's a screenshot of the code
Screenshot 2022-04-04 at 1.07.44 PM

If I reduce the threshold to 2 will the contract sell have less impact on the chart? but at the same time will the sells be more frequent?

Also the same contract has this for buy&sell taxes, so I cannot change them separately.

Screenshot 2022-04-04 at 1.22.11 PM

Is it possible that I can separate the buy and sell taxes so if required I can have nil buy but sell remains as is.

Thank you for your help!