If you play for months and your sprint pb is 33 seconds, you are doing pretty fine. I play at a similar speed to you(my pb is 34 seconds) and I also play with 3(50) DAS, I think it's fine if you are used to it. 3.3 KPP is high in my opinion, you probably utilize a lot of hold. Try disabling it for about a week and then you will no longer hold much.
The main thing about having low KPP is DAS preservation, if you wanna be good at it you need to know which pieces can be used to preserve DAS. Look at any sprint by Eriri/Rideru0 and try to analyze it, you will see that he generally tries to stack in 3 wide gaps. You should try to stack 3x4 rectangles, pay attention to those combinations:
3 pieces on DAS, ends the formation preserving DAS

3 pieces on DAS, does not end formation preserving DAS

2 pieces on DAS, ends the formation preserving DAS

2 pieces on DAS, does not end formation preserving DAS

This is for the right side wall, of course. Otherwise things are mirrored.
There's more to low KPP than that, but that's the basic. You should avoid double rotating the pieces, this is especially relevant for the T piece. Best sprints to watch in order to learn newer shapes are Eriri/Rideru0 and Z2sam.