By Lewis Krauskopf and Saikat Chatterjee NEW YORK/LONDON (Reuters) -After a rocky week for U.S. stocks, a number of Wall Street strategists are pointing to reasons for further caution as investors face tightening monetary policy, corporate earnings, seasonal weakness and other factors that could spell more trouble for equities. The S&P 500 was last down about 1% on Monday after posting its third straight weekly drop and has lost some 11% on a year-to-date basis. With the benchmark index approaching its closing low of 2022, several strategists have warned of more declines to come. “A perfect st…