SIP Investing - High Risk

Hello people I am thinking to invest 50% of my MF portfolio into small cap and 50% into Mid cap. I am a long term investor at least 20years horizon I am thinking about. I have observed the returns are greater when held longer. Any thoughts or any suggestions you would like to give me. I am thinking preferably 1. Kotak small cap fund and 2. HDFC emerging mid cap Just FYI I also have significant amount of stocks held across sectors.