Of course you can adjust the sharpness or softness to your liking and there are several ways to go about this. What preset pack are you referring to though?
Have you tried every preset?
Fine or higher TVL or lower Mask Size presets are usually less sharp.
If you’re using an NTSC preset, you can lower the Resolution Scale.
You can also decrease any parameter that deals with sharpness or adjust any horizontal filter. You can also lower Chroma Resolution / Bleeding.
You can also use a lower “input quality”/resolution Blargg NTSC Video Filter Preset if you’re using those. Many of my presets are designed with the intention of using them in conjunction with some of these video filter presets.
You said the scanlines are too strong, you can adjust that as well by choosing a lower GSL Scanline Type if using one of my Mega Bezel Presets. If using my Sony Megatron Preset pack, you can increase the Scanline Min/Max.
Which presets or presets do you find look too sharp that you’ve tried?
Please include a screenshot to help me to better understand and if you can describe what you’re trying to achieve in a little more detail then perhaps I can better assist.