With spike and without spike drag on blunt body
 

Greetings to all experts,
I have been running a simulation on a hemispherical blunt body on sonicFoam which has a total length of 1 m.
The free-stream conditions are:
U = 2339.26 m/s / Mach 6.82
P = 101325 Pa
T = 300 K
mu = 0.011965
rho_inf = 1.176407
Re no. = 0.23 * 10^6
Other thermal properties like Cv are of standard air.
Both the top wall and the bottom wall is supersonicFreestream.

I have validated an experimental data and the force results checks out well. I have also simulated the same blunt body with a spike of 1m in the front with all the same setup including the schemes and Boundary conditions. (Both reference length while calculating Re no. is taken as 1m)
But when I calculate the drag forces for both, the drag is coming almost same for with spike and without spike which is absurd as the added spike should reduce drag.

I think I have setup the case right but might have missed something? Somebody please help me in this case.

Files link: https://drive.google.com/file/d/1d8Z...usp=drive_link