I wish there was an easy answer to that question. The viewers you are using are close...but the BEST way is to actually put it on the device(s). Ask the professional book makers (Hitch, et al) and they spend a pretty penny buying all these devices to check against. For us lowly plebes... we use the tools we have: Sigil, Calibre, ADE, etc. to check the ePub code, then our own personal devices, and the software viewers you mentioned to check the amazon conversion.
edit: dang! Ninja'd by hitch!
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