Hello Andrew,
the delay mismatch is not an issue until each remote router has only one FR PVC to the hub router.
In order to deal with multiple remote routers you can :
a) increase the input hold queue to its max value
b) you can play with the bandwidth command and the ip eigrp bandwidth-percent in order to shape the eigrp traffic on each FR PVC : the idea is to use a low bandwidth and then to provide space for eigrp traffic with the second command
The questions you need to address are the following :
Is the access link at the hub site oversuscribed ? Ds3 and 130 T1 /subT1
If it is use as bandwidth = access link speed/# DLCI
In addition if you haven't already done configure all remote routers as eigrp stub routers if possible (if no other routers are behind them).
This will save bandwidth during an EIGRP query.
Hope to help
Giuseppe