Vinales topped the second and third days of the test, with Rossi ending up eleventh and 0.921 seconds off that pace on Friday, paying little heed to posting his best time of the test.
While Rossi concentrated on he was focusing on race pace on used tires instead of seeking after the best lap time, the Italian surrenders will require a predominant outing in Qatar's last test one month from now.
"Today we worked an extraordinary arrangement on the pace for the second half of the race, since we persisted around there a year prior," he said.
"We had a go at something extremely phenomenal, however finally we didn't upgrade a significant measure, so we'll need a go at something else.
"I think the bike has awesome points, especially the engine, however for without question this test was more troublesome for me than the one in Sepang.
"I'm not extraordinarily happy and we need to endeavor to move forward."
Made a demand to total up his test, Rossi yielded: "We work a ton to endeavor to improve the notion the bike on old tires, we took a lot of data, we made a hard business, yet finally we didn't settle our issues.
"So we have to try something else for Qatar."
Regardless of the mixed sentiments from the test, Rossi feels he is not far-expelled current pacesetters Vinales and Marc Marquez, who Rossi classed as the title most adored as of late.
"I'm truly close, despite the way that Phillip Island is an unusual track," he included.
"In like manner here, as in Malaysia, the speediest were Marquez and Vinales. We ought to work to arrive closer to them.
"Basically I would state we are there, yet in Malaysia toward the end I could do a tolerable time.
"In case we look at the detachment to the top riders, conceivably here was fairly more terrible."