If you are going to run really light 2 1/2" loads in the A5, you may be better off with the old spring installed. I assume it was the big spring under the front wood you replaced, and not the action spring in the stock.
If you didn't do it already, pull the stock off and remove the action spring, and clean it and the hole it runs in-compressed air works well. Lightly lube, and reassemble.
An A5 will often need some tinkering to work well with lighter loads. The design does allow for some adjustability to make this happen, but, in my experience, most people won't do the work to get them running smoothly.
Then, you have to remember to switch everything around to run regular, or, heavy loads. I've met many people that own A5s that have no clue where the shock absorber is set.
Best,
Ted