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Not a chance. I 100% believe to get more power after flowing head,balance bottom end,carbs,etc you up the comp to get more power. I have seen and heard of alot of engines and came to a conclusion that comp can increase power, especially torque.
Some examples:
My friend here at work's nephew bought a factory 95 Nissan Sentra Works rally car build by Nissan motorsport.It has a SR20DE motor that has been worked with the following:
Full head job.
Rally spec cam.(Anything from 300 to 320 degrees)
Balance job (Revved to 8500 with rally team)
Throttle bodies.
And a comp of something like 13 : 1.
Apparently according to the factory it made 190 to 200Kw.Can't remember if it is flywheel or wheel Kw.
They are going to drop comp to 11 : 1 to increase reliability and decrease engine wear.
I know of a Sabre with head job, mild cam and it makes 150Kw.

Another example is Minnesh's 1200 in Durban. Has all the standard stuff done to the engine and a MASSIVE comp. I think also 13 : 1. It also gives 2litre guys a go and it is a 1400cc engine.
If you want, I can give you his number and then you can chat to him.Very helpful guy.

If I were you I would keep the comp down to use 95 pump fuel.Why? The damn fuel price is going to keep going up and race fuel is very expensive.
I would recommend 10,5 : 1. This is on the edge to be safe. For this I think you will have to check your pistons or skim the GX head to max which I would not recommend as they are very valuable.