This is my take right or wrong but it's what I like to stick too,
Recurves, unstrung you place the bow against a flat surface w/ the limb tips touching 1st and see how much the limb tips support the riser above that flat surface. This is a good indication of the amount of pre-load built into the design. The higher the riser sets off that flat surface. The more the pre-load. Strung, grab the limb tip and twist it! If the bow limb tip is easily twisted, then it will be sensitive to string torqueing. Lastly, while strung, If you grab the string nock and you are able to move the string up and down, limbs moving up and down, again another possible release sensitive characteristic.
All, above can be said w/ longbows w/ excluding the limb tip twist check. Of course there are other factors in a design that can some what balance the factors
mentioned above.