Spider cracks in the gelcoat by the engine mount on my hunter 25' sailboat

I was wondering if anyone can help me to either fix my problem, or
tell me I have nothing to worry about? I have a Hunter 25' sailboat...
1982. I just bought a brand new Mercury 9.9 4 stroke, which weighs in
at 92lbs. My old two stoke was only 76lbs. That prompted me to
construct a new motor mount block, which came out beautiful by the
way. However, I noticed a few spider stress cracks where the
stainless meets the hull. Nothing major, probably about 3 spider
cracks on eiter side of the mount. Should I be worried!?!?! I looked
in the interior part of the hull and there was no stainlesssteel
backing plate for the mount. Should I put one in, or forget about
it. Half of me wants a perfect boat, the other half says, hey...if it
cracks off in the middle of a race, I'm insured! Any feedback?