BOOSTXL-DRV8305EVM: Estimated Rs value much bigger then datasheet value

Part Number:BOOSTXL-DRV8305EVM

Hello,

I am using the BOOSTXL-DRV8305EVM with a relatively small motor with max. current 2A

If I use the standard settings:

#define USER_IQ_FULL_SCALE_CURRENT_A         (24) // BOOSTXL-DRV8305EVM = 24.0 A
#define USER_ADC_FULL_SCALE_CURRENT_A        (47.14)  // BOOSTXL-DRV8305EVM = 47.14 A

gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS1 = Gain1_10VpV;
gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS2 = Gain2_10VpV;
gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS3 = Gain3_10VpV;

the identification is good, I get a value for Rs ~ 1Ohm and Ls ~ 0.05mH.

Now, becaue the max. current of the motor is so low, I want to change the gain of the current amplifier to 80VpV:

#define USER_IQ_FULL_SCALE_CURRENT_A         (3) // BOOSTXL-DRV8305EVM = 24.0 A
#define USER_ADC_FULL_SCALE_CURRENT_A        (5.89)  // BOOSTXL-DRV8305EVM = 47.14 A

gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS1 = Gain1_80VpV;
gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS2 = Gain2_80VpV;
gDrvSpi8305Vars.Ctrl_Reg_0A.GAIN_CS3 = Gain3_80VpV;

If I try this, the identified values are way off. Obviously I am missing some other changes necessary? What else do i have to change?

Thank you in advance!

Stefan