Plotting various K (gain) values for a transfer function to visually optimise control system?

I am trying to finish an anlysis of a system that I have made for the pitch control of a UAV... here is the code Ihave used so far to get the transfer function in matlab and at least get a response plot...

>> s=tf('s');

>> G1=0.2083/(s*(s+171));

>> G2=(1.151*s+0.1774)/(s^3+0.739*s^2+0.921*s);

>> T=(K1*K2*G1*G2)/(1+K1*K2*G1*G2*(1+(s/K1)+(s^2/K1*K2)))

I can then plot the response by applying values to K1 and K2 then running:

>> subplot(2,1,1)

step(T)

subplot(2,1,2)

impulse(T)

But i need to plot many different gain values for both K1 and K2 at the same time to see how they change the output... I have tried to apply a matrix to K1 and K2 but that doesnt let me because the systems are just 1x1tf.

Please help