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1. Input follower
as your equation point out, Q32,Q33,X2,X3 is not only for bias , but also for load of input follower.
So the Gm is
2*gm1*gm2/(gm2+2gm1), then the gain of the follower is
2*gm1*gm2/(gm2+2gm1)*(gm2+2gm1))
2. Sencond Stage
Gain is gm2*(0.5R43||0.5(1/gm3))
I think the load of this stage is 0.5*R43 parallel with 1/gm3, can you explain your RL more clearly?