First, I am not quite clear on the figures, because you didn't break out the specific amounts of the various taxes and deductions that come out of each paycheck. Am I reading it correctly that you currently save:
1. $15K/yr in a Roth 401(k) (20% of $75K);
2. $5500/yr in a Roth IRA; and
3. $10,800/yr in your EF ($450 per semi-monthly paycheck)?
For a total of $31,300, plus whatever else you put away in these random deposits? If your living expenses are $28K (assuming the rest goes to taxes), then you're at over 50% savings, which puts you at a target FIRE timeframe of 15-17 years, depending. See
http://www.mrmoneymustache.com/2012/01/13/the-shockingly-simple-math-behind-early-retirement/. A few thoughts to improve that rather painlessly:
1. Max out the 401(k). With your savings rate, there's no reason not to.
2. Switch from Roth to Traditional IRA/401(k). You are currently putting aside over $20K/yr in post-tax $ in your Roth. If you put that money into traditional 401(k)/IRAs instead, the contributions don't show up as income on your tax returns, which at the listed tax brackets means you will pay $5K/yr less in federal taxes, and $1K/yr less in state taxes.* In other words, you could put away that same $25,500 for retirement, and still have another $6K to put towards something else. Like, say, maxing out your 401(k) and saving for a replacement car. :-)
3. If you really want feedback, you should break out your expenses here. There is a ton of collective wisdom that you can call on to maximize the value you get per the dollar you spend. Your expenses in total don't appear unreasonable, but that answer is different if you are, say, paying a mortgage in the Bay Area (in which case your costs are totally bad-ass) vs. living at home for free in an extremely LCOL area (in which case you are likely living like a king).
4. Yeah, you don't need 50% bonds, unless you are convinced you would panic and sell if the market crashes.
*Yes, that means you do pay taxes when you take the money out of the accounts. But (a) you may be in a lower tax bracket, in which case this option is better, (b) even if you're in the same bracket (which goes up to AGI of $92K), it's still a wash, and (c) there are many options for converting traditional accounts over to Roth accounts down the road in a way that can minimize your tax hit. For most people at your income level, the tax deduction now is worth paying the taxes later.
ETA stuff I forgot.