We are developing a BLE sensor Peripheral to work with an iPad, that requires the following throughput of data on the BLE notification characteristic (no acknowledge) using
Are you sending "write without response" commands? You can send 4 packets per connection event this way. Using you previous 20ms connection interval, you would be sending 4 packets with 20 bytes every 0.02 seconds. Putting that together: 4*20/0.02 = 4000 bytes per second easy.
I highly doubt you are getting corrupt data. The link layer adds a CRC and a 2 bits of "next expected" to BLE packets to ensure A) all the bits are received correctly and b) packets were not sent out of order. The TI stack and iOS control the link layer so I doubt you've botched that.