Is my Sri Lanka flight ticket sufficient for my second SETV application given my travel plans?

I am currently at the end of my first SETV. I am traveling to Hanoi next week for two weeks and will apply for a second SETV. My question is regarding my ongoing flight. I have a ticket to Sri Lanka for March 29th for a two-week trip (and will apply for a re-entry permit). I plan to go to Dubai at the end of my 60-day plus 30-day extension (around June 17th), but I don't want to buy my ticket just yet. Is my ticket to Sri Lanka enough, even though I'll put 90 days on my visa application and the flight will only be three weeks after my application date? Or should I just put two weeks on my visa application to match the ongoing flight even though I plan to stay closer to the full 90 days? Note: I'm not open to buying a "fake" ticket as an alternative. Thanks for the help.