Let me also say that I support at least a $10,000 standard deduction. Really, $15,000 would be better so all full time minimum wage work would be tax exempt. The proposal should be revenue neutral when adjusting for the standard deduction component.
If the proposal still doesn't shake out toward neutrality after a hefty standard deduction, rate cuts should go toward the 15% and 20% brackets.
Also, I encouraged an investment income deduction before. I think $50,000 was probably much too small. There are a couple ways of to expand that and provide a more equitable treatment of investment. One is to just raise it from $50k. Probably at least in the upper hundreds of thousands.
Beyond that, the House GOP tax proposal from Better Way includes an exclusion for investment income of 50% while taxing capital gains at regular income tax rates. I like this approach.