We used to throw around similar sized recipe files, and never had any issues, but it was always to wired controller.
My guess is that the Wifi is buffering some of those 1250 values and that's where the 10 seconds delay / dropped values is occurring.
Since you have two controllers AND you have the 1250 values broken into 20 tables I would be looking at using the scratch pad area.
You could break it into 20 chunks and mange the data transfer to each chuck via a chart.
Take a look at the PAC Control command reference guide and check out the scratch pad area commands, as you do I think you will find a way that you are comfortable moving the data between the two controllers as needed.
Lastly, because you are using SoftPAC, you can have another chart move those float tables to the file area of the controller which is in effect the computer hard drive and thus you end up with the same result as the PAC Display recipe file.... the data will be on the PC hard drive.