Solderpaste types have a big effect on print performance. Go to this link to see if the solderpaste you are using has been tested, see "Rheometric Pump Paste Tests" under MPM:
http://www.speedlinetech.com/news_publications/application-notes.aspx?OnId=4
MPM tech support will likely give you good advice on parameter settings, call 800-737-8110, or e-mail them at mpm_tsc@speedlinetech.com
Also, having the correct pump head blade width vs board width makes a big difference too, like if you have 16" pump head and printing 6" wide boards- too much solderpaste will get impacted in the head.
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