Hi frankr
The only reason I can see why your position would be losing value is that goog iv is rising. If this was not the case then your long should gain more value than your short. Furthermore the rise in iv must be greater than the rise in shareprice for you to lose premium (and I don't think that has happened). Remember that iv usually rises prior to earnings/announcements etc.. There must be another explanation for your dilemma.
Thus I have looked at the option prices of your legs and it seems they are the opposite of what you have said, i.e. your long call is gaining more value than your short:
1/25 440 premium was 52.1, 450 premium was 47.5, net=4.6cred
1/24 440 premium was 56.3, 450 premium was 51.7, net=4.6cred
1/23 440 premium was 46.3, 450 premium was 42.2, net=4.1cred
So, your credit has increased over the last few days and you are ahead. Well done. Just sit tight or close your spread for a profit. Also you should review your optionetics manuals, particularly the section on debit spreads and volatility - also check on optionetics platinum for your risk graphs and the different scenarios when iv/underlying changes and go to as many 2 day seminars (as a refresher - it's free) as possible.
Cheers