You shouldn't have to worry about getting evicted for going over income. If your income rises to as high as 140 percent of AMGI, there's no problem. If your income rises above that level, it may require the landlord to take steps to make sure the building stays qualified for all its tax credits.
In the worst case, your landlord may (with proper notice) switch your apartment to market-rate, and you would lose the benefit of your restricted rent. However, if your income is that high, you're not low income and you should be able to afford the market-rate rent. Landlords at tax credit properties can only evict tenants for "good cause" as defined by state or local laws. This also means your landlord can't decide to not renew your lease without good cause.