Hi,
here is a short tutorial with 6 different ways to adress bad timing - that should work.
From these methods mentioned in the video I recommend Free Warp in your case (8th notes on a bass). This way you can set/drag the markers manually and check one by one if you hit the right spot by listening to a click/beat. This will probably yield the best results.
Here are 2 tips:
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Set the first and the last marker at the very start and end of the whole audio event first, then set the markers on notes that seem to be right on spot inside your audio event. Only now set the markers on notes (peaks) that are out of sync and start dragging/listening/dragging/listening until it sounds right.
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Try to set the markers itself always at the first transient peak (wave with the highest amplitude within the first milliseconds of a note) - not at the very start of the new 8th note if you dealing with that kind of material (bass/guitar).
With more experience you will get much better and faster at detecting the right spots.