Help needed with setup B5M

[hawksport]

HI,

I ran my B5M indoor on astro for the first time and struggled with the set up,

Slow speed corner entry is good then as you put the power down it under steers, I just feel as I cant push the car hard, tried going softer and it just felt like the front end just tucked under it self, went harder and it under steered more,
Any help would very thankful

Cheers Ian