Most people don't put that much into small cap stocks, you generally see 10% recommended as a max because they can be extremely volatile. The fact they they are small companies means they are statistically more likely to fail. You've also got a bunch into total stock market, which by nature includes small caps in it, since it's the "total" market. So you are, in effect, doubling up on small caps, even more than the 20%. Over the past decade, small caps have done better than large, but that probably makes it less likely that they will do it again over the next decade, but who knows? I'd probably keep small caps to 15%, and add the other 15% to total stock market or dividend yield, or split between both.
I've been studying VHDYX, and I think it is a great idea and plan on buying some soon.
Also, to address your comment: "Being from Europe and knowing the kind of mess it's in I don't really want to invest much in developed Europe." Remember, when things are a mess is EXACTLY when you want to invest in them. Assuming what you are investing in doesn't go out of business and disappear of course, which is highly unlikely to happen with Europe. It's still an Index, so you're still buying the whole market, more or less.
I personally don't like TIPS, because they are a conflict of interest. The Gov't publishes what they feel is the current inflation numbers, then they have to pay you more money or less money based on the numbers they themselves just published. If I was worried about inflation, I would buy gold instead. Gold will cover you during inflation, and it is priced based on a free, worldwide market.