EVERYONE has different opinions on how much to feed so I hesitate giving advice on this but if it were me I would feed as much as they want to eat at that age (as long as there is no regurgitation and/or cant move b/c they ate too much). With a lot of food can come a faster growth rate and that can cause some problems if you aren’t gutloading the crickets and supplementing properly. Supplementing, another tricky topic and I am going to stay away from for now, but for cricket gutloading I would check out cricketfood.com.
-roo