Hy
I think it a good idea to make including this combination (it is requested by client to consider the 3 accelerations acting simultaneously):

W+P1+U1+U2+U3
W+P1+U1+U2-U3
W+P1+U1-U2-U3
W+P1-U1-U2-U3
W+P1-U1+U2+U3
W+P1-U1-U2+U3
W+P1+U1-U2+U3
W+P1-U1+U2-U3

identical with displacement :

W+P1+U1+U2+U3 +D1+D2+D3
W+P1+U1+U2-U3 +D1+D2-D3
W+P1+U1-U2-U3 +D1-D2-D3
W+P1-U1-U2-U3 -D1-D2-D3
W+P1-U1+U2+U3 -D1+D2+D3
W+P1-U1-U2+U3 -D1-D2+D3
W+P1+U1-U2+U3 +D1-D2+D3
W+P1-U1+U2-U3 -D1+D2-D3

AND after that you cam make :
MAX first group : acceleration
MAX second group : acc + disp