Whats wrong with this ckt??

Hi I am trying this folded cascode, like in P allen, I cant get it to work, my pmos on top not in sat, where am I going wrong?? please help, thanks.
here is a little script of how I tried it, transistor number here match the ones in schematic

Vdd=2.5;Vss=0;
u=1e-6;Kp=2*25.5*u;Kn=2*109.7*u;Voutmin=.7;
Voutmax=1.8;Vtn=0.4465;Vtp=0.611;
Cload=2e-12;SR=30e6;Vinmax=1.5;Vinmin=1;L=1.5*u;
Vtnmin=.426; Vtnmax=.439;Vtpmin=.61; Vtpmax=.613;GB=2*pi*20e6
%I5=bias current=SR*Cload
I3=SR*Cload
%Choose I3=1.1 to1.4 times I3.
I5=1.5*I3/2,I4=I5;
%For max output swing
Vov5=(Vdd-Voutmax)/2; Vov7=(Vdd-Voutmax)/2
W5=2*L*I5/(Kp*Vov5*Vov5)
W4=W5,W14=W5
I=I5-I3/2
%Assuming worse case current in M6 & M7
W7=2*L*I/(Kp*Vov7*Vov7)
W6=W7,W13=W7
%For min output swing
Vov9=(Voutmin-Vss)/2; Vov11=(Voutmin-Vss)/2
W9=2*L*I5/(Kn*Vov9*Vov9)
W8=W9, W10=W9, W11=W9
Vov14=Vov5; Vov8=Vov9;
R1=Vov5/I5
R2=Vov9/I5
%From GB spec find W1 &W2
W1=GB^2*Cload^2*L/(Kn*I3)
W2=W1
%Minimum ICMR defines
V=(I3*L/(Kn*W1))^.5
Vov3=Vinmin-Vss-V-Vtnmax
W3=2*I3*L/(Kn*Vov3*Vov3)
W12=I5/I3*W3

At least one problem comes from the fact that N12 is smaller than N3. O the other hand, P4 and P5, and P6 and P7 are identical to P14 and P13 respectively. But the current through P6 (P7) is smaller than the current through P13 so that the drain voltages of P4 and P5 are not the same as P14. MAke N12 identical to (or prportionally smaller than) N3 and make P6 and P7 half the size of P13 (or the corresponding proportion)

Another problem is that R1 is too small, so P13 is "struggling" P14. Increase R1 till getting P14 into saturation.

Think to do the same with the N-mirror.