Hraban's suggestion works really well. I setup hyphenation rules for the 
underfull boxes of Russian names and reduced the \tolerance to 600.  I'm 
now down to about 20 underfull boxes which to my eyes look fine.

Thanks again Hraban

Best Wishes

Keith

On 28/07/2023 19:20, Keith McKay wrote:

> Thanks Hraban, didn't think of that so will give it a try.
> Best Wishes
> Keith
>
>
> On Fri, 28 Jul 2023, 17:28 Henning Hraban Ramm, <texml@fiee.net> wrote:
>
>     Am 28.07.23 um 17:04 schrieb Keith McKay:
>     > I played around with the setups for the align:pass:test4 code
>     below, as
>     > Hans suggested, and it was changing the \tolerance value which
>     made the
>     > difference. Increasing the \tolerance value to 1000 eliminated all
>     > overfull hboxes but still left 79 underfull hboxes. I continued to
>     > increase the \tolerance value up to 6600 and was left with two
>     overfull
>     > hboxes. One with a badness of 6641 (warAndPeace1.png) and one
>     with a
>     > badness of 1097 (warAndPeace2.png). Above the \tolerance of 6600
>     only
>     > warAndPeace2.png was left with a badness of 1097. Both of these
>     > underfull hboxes were at the beginning of a paragraph - "To his
>     Honor"
>     > in the first png and "Well, you see," in the second png. I not
>     sure a
>     > reader would spot the second png badness but the first is
>     noticeable to
>     > my eyes.
>
>     Hi Keith,
>     since both cases are caused by names with accents, did you try to add
>     hyphenation exceptions for those? Such cases are probably not
>     covered by
>     English hyphentation rules.
>
>     Hraban
>
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