wellcraft deck problems?

hi guys,
im new here. Iown a 1991 wellcraft 18 ccf . I just had the transom and stringers replaced. Now 2 years later im trying to figure out if deck is ok. When i walk on the floor it flexes. Its not bad..just a little give.. but i want to prevent it from getting worse. From what i can tell the core is good. I really dont want to remove the top again. I been reading about cpes and laminating epoxy. What i thought i would do is drill small holes in deck and pump cpes ..then laminating epoxy to make this hard again. What you think? The floor ,so i was told,is normal that it flexes a little. Any ideas is appreciated.