Is this normal?

im gonna take a wild guess and say the 42# injectors are too big for only 7 psi and like you said your running rich. And from your sig it doesnt look like you have an aftermarket H/C/I combo done so you can i ask why you would run that big of an injector with a stock/near stock engine and a blower...id say try 30 lb injectors, or a H/C/I combo....but im no expert

You're deffinently running rich. The MAF only tricks the computer to run with the 42# injectors, but the pulse/dwell cycle of the original 19# injectors are still programed into the ECU. A tune will remedy most of the issues you experience or a stand alone tuner / wideband O2.

Did you buy your maf new or used? If new - was it purchased recently? If so, I'd contact ProM (or their new incarnation) and talk with them first about what it's doing. It should idle/run reasonably well with their calibration.

Start up can be a problem because the computer holds the injectors open for a specific period of time -- and with 42's compared to 19's you're getting over twice as much fuel at start up -- it's simply flooding. The ONLY way to remedy that permanently is to alter that parameter in the ecu with chip/tweecer/pms. Temporarily you can try starting with the gas pedal on the floor. I believe that keeps the engine from injecting so much fuel at start up.

Here's ideal - have the 80mm calibrated for 19# injectors, and have ProM send you a multi-point (it's like 21 or 31 points) voltage vs. mass flow transfer function. Use your tuning device to load the transfer function into your ecu. Then use your tuning device to select the size injector you're using. That should match things up perfectly. But it won't help the start up fuel issue -- your tuning device should be able to access the tables that control start up fuel -- and reduce it.