oh, I got that one... but as I remember that is for accelerating a transaction
I thought when you said 'pushed' you meant pushing rawtx to AntPool node to relay and broadcast the tx
are you sure your transaction actually <1s/B, can you tell me txid
because afaik, many nodes are rejecting (not relaying) tx with less than 1s/B feerate
if you see <1s/B tx fee on blockchain.info, they don't show tx feerate correctly for segwit txs