Formula in Crystal Reports

I have built the following formula in crystal.  The problem is - is that it never works the same each time.  I think it may have something to do with the true and else statements but I cannot be sure.  My goal - I have a report with several parameters.  If the parameter is blank, the assume all records, otherwise, use the filter.

I could potentiallhave up to 10 different parameters in one large report, so it could have a multitude of combinations of blank verses not blank.

IT is very odd how sometimes certain fields will cause the data to filter, but othertimes it will not - I have tried numerous combinations, but have not yet hit a pattern.

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if {ACTRTV01.B1LWNB} in {?SvcAcctFrom} to {?SvcAcctthru} then true
and
if {?Site} = "" then true
else
{ACTRTV01.B1EKCF} = uppercase({?Site}) 
and
if {?City} = "" then true
else
{HOURTV01.CITY} = uppercase({?City})
and
If {?Charge Code Selection} = "" then true 
else {RECRTV01.CPJPCD} = uppercase({?Charge Code Selection})