An initial look at the configuration looks ok.
But for a start, please ensure that your device only has one default gateway. Currently the default gateway point in three directions:
routing-options {
static {
route 0.0.0.0/0 next-hop [ 10.10.1.1 14.125.127.225 192.168.1.1 ];
}
}Please remove the two which are wrong, retest and revert with the result.
Secondly I would recommend you to upgrade to 15.1X49-D50 as there are many bugs in the initial releases for the SRX300 series.