optimization of a function using optiminzation toolbox commands

Hello,I have built a function in the code shown bellow.The function is plotted as follows.

my goal is to lower the lobe at X=-22 from -7.4 to -15 without changing the rest of the plot.

For that i need to optimize real_voltage and phases vectors.

Is there a matlab function which could use maybe "genetic algorithm" to get me values of real_voltage and phases vectors which would produce such result?

Thanks.

clear all
clc
amplitude_norm_V=[1,1,1,1,1,1,1,1];
x=sqrt(1/(sum(amplitude_norm_V.^2)));
real_voltage=amplitude_norm_V.*x;
real_power=(real_voltage.^2);
sum(real_power);
phases=[0,0,0,0,0,0,0,0]

phases = 1×8

0 0 0 0 0 0 0 0

theta=linspace(-pi/2,pi/2,1000);
theta_0=pi*((0)/180);
f=5.6;
N=10;
lambda=300/f;
k=(2*pi)/lambda;
d=0.8*lambda;
total=0;
tot=0;
delta=k*d*sin(theta_0);
for z=1:8
AF=real_voltage(z)*exp(1i*(phases(z)/180*pi))*exp(-1i*(z-1)*(k*d*sin(theta)+delta));
total=total+AF;
end
plot((theta/pi)*180,20*log10(total));

Warning: Imaginary parts of complex X and/or Y arguments ignored.