HELP - cold air problem

[Flanagan, Stephen CECOM RDEC STCD]

I am running a single turbo with a sheet metal intake.  Car has made some
great HP to date but I have been only using an air to air intercooler.

With the air/air the air charge goes from 100 deg up to about 270 deg (+/-
20deg)
depending on the days conditions.  

I had my intercooler boxed in and now have an ice-water/air intercooler, now
the air charge goes from 70 deg up to about 130 deg.  The car runs great
through
1st gear, but breaks up in high gear (2 speed automatic - powerglide).
Spend several
days on the track and 8 pulls on a dyno using WB02 (Horiba).  The only way
to clean up 
the high gear was to lean it out, but the egts went way too high.  

Does anyone have any ideas what could be the major problem?  I am thinking
that the 
fuel may not be atomized correctly at the colder temps, if so, what is a
good action
to try. 

I have seemed to lose around 150 hp after the intercooler change.  car was
running
high 7'50s, now it is running 7.70s to 7.90s.  I do not want to get rid of
the 
cold air intercooler because I know it is worth at least 100 hp.  (Keep in
mind this
is on a 1500+ hp setup).

TIA, Steve F  

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