* HSI +0.4 pct, H-shares +0.8 pct, CSI300 +3.1 pct * HSI stymied again at resistance at May 2011 high * China banks, brokers gain on policy cues * China Cosco hammered after profit warning By Clement Tan HONG KONG, Jan 28 (Reuters) - China shares jumped to their best day in two weeks on Monday, sparking Hong Kong gains, as investors welcomed comments by a senior central bank official seen as a tacit admission that bank profits need to be protected.