You are talking about 'new posts' rather than 'latest posts'? (I find the definitions of those two to be rather too close and I wish there was more distinct terminology that could be used (new threads and latest posts perhaps?), but that's a bit off topic).
I have a work-around for 'latest posts', but it doesn't work for 'new posts', in spite of the similarity.
Looking at the link that gets used, the critical parameter seems to be 'daysprune', which, by default, is set 7. If you think that a moderate amount more 'history' can solve your problem setting 'daysprune' to, eg, 14 would give you a lot more to play with.
You could do this manually on a case-by-case basis, or you could bookmark latest post with a daysprune parameter set at 14. When you go back into the history, the daysprune does not get set back to the default value, so that's fine, as it allows you to work back as far as you would like into the history.
And if you are an opera user, and use their speed-dial thingummy, you can set a thumbnail there to use 14 days (or something else) as a value for daysprune.
The only trouble is that there is a lot more stuff in latest posts than in new posts, and that means there are more pages to scroll through. This might not suit you at all.