I don't have a recommendation; everything I believe about this stuff I got from my own research, some of it gleaned from the contributions of people on this website in other threads. Other users of this website may have other information, or a recommendation for an accountant.
I think you actually have four broad questions you need answers to:
1) Are your income and overseas wealth/assets subject to Argentina tax (I suspect not, if your annual visit schedule stays as you describe it).
2) How do you need to behave to keep them exempt from Argentine tax (i.e., in what circumstances could your income and overseas wealth/assets become taxable if you stray from your current pattern).
3) Even if exempt from income and assets tax, do you need to, technically, do anything specific--now that you are an Argentine (migration) resident--to comply with Argentine legal reporting requirements in respect of taxation (e.g., lodge an annual declaration even if you have no taxable income or wealth to declare).
4) If you do need to, technically, do something (like lodge a nil declaration), is it wise to do so, and what would be the risk of not doing so (and how would you go about not doing so).