Be careful how you add up the numbers. Don’t forget that the Shield Command also works on your orca. It is only the mining burst that gives you no direct benefit. If you only fit one shield + one mining burst you will be able to fit a bulkhead in low instead of the reactor. That combination should give you close to 350+ k EHP. Plus, the point of the MWD is you can hit warp in about 12 sec. If you cannot survive under those conditions, then I doubt that the extra 150 k EHP you had will help, especially as that fit will have you in warp in about 48 secs?