This is not a disaster...both problems can be fixed easily with a little patience.
As beerocd says, if there's a leak you'd better find it, otherwise you'll be wasting CO2 (aka money in this instance).
For finding the leak, as he says soapy water or StarSan works great; when the liquid meets the leak, it makes bubbles. Spray wherever there is a fitting or hose connection, including any fitting on the regulator, such as gauges; tighten anything that bubbles.
Once your sure you have no leak, you can then work on getting your carbonation right.
Lets keep it simple: if your kegs are chilled to anywhere around the low 40s temperature wise, then set your CO2 pressure to 12 PSI...this will give you around 2.2 to 2.5 volumes of CO2 (go to 15 PSI if you want a little more fizz, or if your beer is stored in the high 40s)
Start with the CO2 tank on the Munich Helles...attach it and leave it attached for a few days...this should give you reasonable levels of carbonation.Try a test glass after two days.
For the IPA, vent the keg to lower the pressure in it; after a day or two, this should cause excess CO2 in the beer to come out of solution, and lower your overall carbonation....this can be happening during the first two days the Helles is hooked up to the CO2 tank. When the Helles seems right, move the CO2 over to the IPA, and let it condition for two days then try it.
I hope this makes sense...it's sometimes difficult to explain procedures easily in a short message.
Keep checking back here as someone else may have a simpler or easier method to recommend, or may think of something I have missed. Someone else may have a better carbonation method, but I'm more consistent when I use time and the right temperature/pressure settings.