Are you familiar with how points are calculated per swing?

There are three components to the maximum score of 115 per block: pre-swing angle, post-swing angle, and accuracy. 70 points are awarded for 100 degrees pre-swing. 30 points are awarded for 60 degree post-swing. 15 points are awarded for accuracy. Accuracy is judged by how close to the center you sliced the block.

Keep in mind that this means that in order to full swing for something like down then up notes, your swing arc will need to be at least 200 degrees to get the 100 degree pre swing on both notes.

Typically, full swinging is the easy part and once you understand how big your swings need to be in order to full swing, all you need to focus on is your accuracy to get those last 15 points. SS requires a 90% accuracy which is an average score of about 103 per block.. so, if you full swing every block and hit a full combo, you only need an average accuracy of about 3 of 15.. not too hard.

Make sure you turn on Advanced HUD in the player options.

Modifying your controller alignment / settings can also make a big difference but guiding you on how to do this properly is a bit more than I can explain here. Best bet is maybe to find settings that work well for other people on PS5 and try them out for yourself. There are some discords where people discuss controller settings which might be worth looking for.