I started to create my own portfolio of currencies (small one, 2500 to start), where BTC represents 20%, and LTC 35% (and some loss, right now :-( )
So, I wonder if I should not trade some of my LTC for BTC
I think it would be better the other way around, 35% BTC(or more) and 20% LTC. So you should sell some LTC not all, and also invest the remaining in some other coins ETH XMR, etc. Usually, as it has been seen, LTC and BTC go hand in hand if one takes a dive then so does the other and if one rises the other also will follow soon, so LTC should be up in no time.