Answers to Macdog:

sum of two independent queues combined queues
total people in line = Lq + Lq 4.39 + 4.39 =8.78 6.56
Wq  = avg per person 6.99 5.69

Answers to Learning curves and the real world:

ignore the first time point, it is FUBAR (see google)
the critical concept is doubling of experience gives the learning percent.
140/190 =.74
120/160 = .75
105/140 = .75

therefore a 75% curve is the best fit

T1 should have been  199/0.75 =  253
72/253 = 0.284 is the factor for Tn
look it up on thre table for 75% learning curve gives 21 or 22 lots.
Yes, innovation is eventually worthwhile, but you have to be willing to invest for the system to "learn the improved process. If it is a good process that makes life easier for the night shift operators, it will work and efficiency will be improved.