Currently the most I hold is Bitcoin and a little OMG and ETH but trader wise, is there a recommended percentage?
My current holdings are:
BTC 60.75%
OMG 33.74%
ETH 5.51%
I don't think there is a certain recommended percentage of holding coins. The choice is yours, you do your own good by buying the coins which you think might benefit by the end of the day. However, I would advice that you add some more coins on your list if your willing to make quick profit.
There's no like standard recommended percentage, but it's always a good idea to diversify more depending on how much value you're holding. Let's say for example you're holding like $50, then there's almost no point in diversifying with such low budget. But if you're holding like $5000 or so, it would be best to diversify.
I think you're holding too much OmiseGo in my opinion. Good tech, yes, but I wouldn't risk as much as 30% on it. I suggest using a 50-10-10-10-10-10 ratio of cryptocurrencies instead, with 50% bitcoin. But it's up to you.

I will have to agree with you, I think he is holding too much omg as well, I do have it but i think I have like 5-6%, 33% is too much risk for him. If it doesn't do good then it means he will have to lose on his investment.