new starter is weird

I started a pineapple juice based starter 6 days ago, and it was nice and bubbly and active on day 4. Then I started feeding it twice a day 1:5:5 with whole wheat flour. That's when things went weird. It does doubles and domes nicely after 7-8 hours, and stays domed and continues to go past doubling after another hour or hour and a half. It has some nice bubbles going on inside, below the top, but the top itself is only mildly bubbly. And it doesn't smell all that convincing. Just not fresh and sharp. Not foul, just not overly yeasty and not the way some other starters have smelled before (like Hefeweizen, mmmm). What the heck is going on? Does it need more time? Should I feed it more? Less? I keep it at 75 degrees: too warm/cool at this stage?
via:http://www.thefreshloaf.com/node/37873/new-starter-weird