My two cents here.... Options portfolio's performance is always tricky. I'm a member of other big options and stocks services (highly reputable services) and they have similar issues because there are always ongoing transactions (trades, dividends, reinvestment or not, etc) in the portfolios.
To add even more transparency, I'd simply list a break down each trades to provide the in and out prices of each contract and type (Put/Call).Then, it's up to the members to calculate the performance (ROIC, Portfolio on the time basis they want to) as they wish. That said, I know that we can always dig the info by going through all the posts one by one but it's time consuming.
Another thing you might want to do is to simply specify the value of the portfolio at the beginning of the year and at the end (Typical portfolio ex: $10k Jan 1st, 2013 and $18,970 on Dec 31st, 2013 if I read your performance table correctly). I care for ROIC but I care even more for what's left in my pockets at the end of each year.
Finally, you may want to explain how all your returns are calculated (ROIC, SteadyOptions Monthly Returns, total etc) in a sub page as I'm sure that not all members are 100% comfortable with all the terminology, starting with me.
Hopefully this "investimonial review" won't ruin your weekend.
Cheers!