Low PH runoff, dealing with deficiency due to low soil PH. Added lime and PH went from 5.4 to 5.0 after watering. How to raise it safely and quickly?

That kind of lime is VERY slow acting. If you want to raise the pH, you need to use the industry standard which is General Hydroponics pH-UP... forget the fact that you've added the lime - just ignore it and focus only on the readings you're getting - you shouldn't care HOW the soil pH reads 5.0 - you should only care that the readings go up. If you water with Spring Water or, honestly, most tap water, the pH of that is usually 7.0+ so just doing that alone should raise the pH of your soil but that won't happen quickly... To raise the pH of the soil QUICKLY, you'll need to flush your plant. 3x the pot volume of pH'd water through her so for you that means running 9 gallons of pH'd water through each pot you want to correct. Check the pH of the runoff and if, after 8 gallons, if it still is not where you want it to be, keep going... keep going until the runoff pH is ok. Then give one last gallon and in that last gallon, add in 1/2 strength nutes and a dose of calmag because she'll be starving and will need something to munch on. Once she's dried out thoroughly, you can give her a drink of plain pH'd water again and then, when dry from that, you can resume your nutes at the strength you'd been giving them. Make sure, though, that they're not heavy on nitrogen as this will cause another lockout of other nutrients that are essential for flowering. One thing I'm sure you're aware of but will say anyway - even when you have corrected deficiencies such as your calcium deficiency, the leaves that had been damaged are NOT going to get better... the only way you'll know that you've fixed the problem is if there are no further signs on other leaves of the deficiency... Good luck...