Is there a reason for not running them as separate collections sequentially?
Else
You can use iteration as check for flow control and make your collection quite fragile.
are your tests separated in folders already or are they just in a long chain?
Why run them all together as a single run ? Seems like 35 APIs are always called along with 5 or 10, so why not 3 runs? Or 2 runs with 49 and 45 requests respectively? Sound like you want to do everything at once which will give you maintenance issuea