so basically you want me to slowly add pure swirling chakra to my swirling sand...Ok good.
Rasengan is raw chakra. That sand ball is made of pure sand chakra basically.
You currently can make them at the two extreme ends of the spectrum: just sand, and just chakra.
The trick will be to combine the two, thereby making the technique more powerful.
It'll be easier if you start with just sand chakra, and then try and simplify it to half sand / half raw chakra.
Try it out.
See, by adding chakra to the rasengan, you overwhelm it and it explodes.ok well let me try combining my sand with a rasengan....*concentrates on adding sand to rasengan untill it explodes flying me into a tree*...that hurt
Hit it into that tree over there.ok...*starts swilling sand and then starts infusing it with pure chakra*..i think i got it..*walks up to bsama with a rasengan combined with sand*..hows that?
Hrm... it doesn't seem like the shaving power of the sand is really coming into play.ok...*walks over to tree and slams sand rasengan into tree creating a hole and removing the bark in a foot wide circle*
Try to compress it.ok..*concentrates on adding more sand, spinning the ball faster and adds more chakra to the rasengan..the ball grows bigger*...hows this?
Perfectok..*walks over to a different tree and smashes sand rasengan into tree, emphasizing the grinding..creates a larger crater and completly stripps the tree of bark*..hows that?