This isn't necessarily strictly what you're after, but it's worth stressing that actual specialists have largely abandoned the notion of a 'Silk Road', and its continued invocation is partly due to intertia among non-specialists and partly, quite probably, due to the influence of modern Chinese geopolitical ambitions and propagandistic narratives that have been spread as a result of that (and sadly, Peter Frankopan's The Silk Roads does rather fall into this trap). Two books by Scott C. Levi cover the issues in depth: the more recent one, The Bukharan Crisis (2020), includes a fantastic deconstruction of the 'Silk Road' as concept and as narrative. For a discussion of actual trade dynamics in Central Asia, the (in retrospect rather ironically titled) Caravans: Indian Merchants on the Silk Road (2015) introduces a South Asian element into what is normally seen in terms of a dynamic framed as Europe/Middle East/East Asia.