I have a medela mini electric plus but the motor seems quite weak. I have tried various breast shield sizes but the nipple does not move ...tmi I know. I need to express as I am doing a course on Saturday ..what type of pump would you recommend , was looking at the medela swing but it is quite expensive, want to be sure it is good before I invest again.. Also how much would you express per feed? Midwife told me 120 MLS per bottle but I don't think I can express that volume...tia..