From the wiki:
Page offsets are not yet supported: e.g. logosres:hlmnbblhbk;ref=Page.p_591;off=759 will go to the start of the page.
Is this going to change soon?
Sorry, this is still a known issue in Personal Books. We do plan to solve it, but it may not be "soon". (Unfortunately, it's not an easy problem to solve, due to the way hyperlinks are stored inside Logos resources.)
