Complete dev will give larger silver grains which tend to cooler tone in these kinds of paper/dev combinations. Premature "snatch" dev tends warmer. Another trick I often use with VC papers when I want cooler tones is to dev the original neg itself a little soft so that the paper needs to be exposed with more blue or magenta light, since in most cases, the higher contrast layer seems to have bigger silver grains and tend colder (hence the ability of some papers to split tone if you work the rules accordingly. Everything depends on the specific paper and dev of course; so you need to test.