I am trying to modify my citation style such that the bibliography sorts hierarchically as follows:

1) Author (i.e., first author last name) ascending alphabetically (A to Z);
2) Number of authors ascending 1 to X, i.e. - if I have 5 papers by the same first author, their single-authored papers will appear before co-authored papers with 1, then 2, then 3, then X additional authors;
3) By year descending (i.e., most recent pubs first).

It should look something like this:

Dodd, C.K., Jr. 1991. The status of the Red Hills Salamander Phaeognathus hubrichti, Alabama, USA, 1976–1988. Biological Conservation 55:57–75.

Dodd, C.K., Jr., and B.S. Cade. 1998. Movement patterns and the conservation of amphibians breeding in small, temporary wetlands. Conservation Biology 12:331–339.

Dodd, C.K., Jr., and R.A. Seigel. 1991. Relocation, repatriation, and translocation of amphibians and reptiles: are they conservation strategies that work? Herpetologica 47:336–350.

Dodd, C.K., Jr., W.J. Barichivich, and L.L. Smith. 2004. Effectiveness of a barrier wall and culverts in reducing wildlife mortality on a heavily traveled highway in Florida. Biological Conservation 118:619–631.

Dodd, C.K., Jr., K.M. Enge, and J.N. Stuart. 1989. Reptiles on highways in north-central Alabama, USA. Journal of Herpetology 23:197–200.

I found the following previous discussion that is somewhat similar, and set-up my style code following the suggestion:

https://forums.zotero.org/discussion/37506/cls-code-to-sort-biblio-by-first-author-and-number-of-authors/

Unfortunately it doesn't quite work as hoped where my bibliography actually looks something like this:

Dodd, C.K., J., W.J. Barichivich, and L.L. Smith. 2004. Effectiveness of a barrier wall and culverts in reducing wildlife mortality on a heavily traveled highway in Florida. Biological Conservation 118:619–631.

Dodd, C.K., J., and B.S. Cade. 2008. Movement Patterns and the Conservation of Amphibians Breeding in Small, Temporary Wetlands. Conservation Biology 12:331–339.

Dodd, C.K., J., K.M. Enge, and J.N. Stuart. 1989. Reptiles on highways in north-central Alabama, USA. Journal of Herpetology 23:197–200.

Dodd, C.K., J., and R.A. Seigel. 1991. Relocation, repatriation, and translocation of amphibians and reptiles: are they conservation strategies that work?. Herpetologica 47:336–349.

Dodd, C.K., J. 1991. The status of the Red Hills salamander Phaeognathus hubrichti, Alabama, USA, 1976–1988. Biological Conservation 55:57–75.

Notice that 3 author papers are sorted ahead of 1 and 2 author papers, and there is a 3 author, then a 2 author, then a 3 author, then a 2 author, then the 1 author. The date seems to be sorting correctly, but it seems to be sorting hierarchically ahead of number of authors which is not what I want.

Here is the relevant portions of my style code:

<macro name="author">
<names variable="author" suffix=".">
<name and="text" delimiter-precedes-last="always" et-al-min="11" et-al-use-first="10" initialize-with="." name-as-sort-order="first"/>
<label prefix=", "/>
<substitute>
<names variable="editor"/>
<text variable="title" form="short"/>
</substitute>
</names>
</macro>

<macro name="author-count">
<names variable="author">
<name form="count"/>
<substitute>
<names variable="editor"/>
</substitute>
</names>
</macro>

<macro name="year-date">
<choose>
<if variable="issued">
<date variable="issued">
<date-part name="year"/>
</date>
<text variable="year-suffix" font-style="italic"/>
</if>
<else>
<text term="no date" form="short"/>
</else>
</choose>
</macro>

<bibliography entry-spacing="0" hanging-indent="true">
<sort>
<key macro="author"/>
<key macro="author-count" sort="ascending"/>
<key macro="year-date" sort="descending"/>
</sort>

Can anyone help with this??

Thanks!

Matt