SR20 boost/misfiring problems after 14psi

[dorkidori_s13]

im wondering if ne one else has had this issue...

currently we have 2 cars at the shop who are encountering this issue (mine and the owner/foreman of the shop)...we both are currently running PowerFC DJetros with a 2.8bar MAP sensor with upgraded injectors (mine are 630cc and his are 770cc)...both of our cars have been tuned on a mustang dyno up to 12 PSI...however when we go up one more boost level to 14psi tuning with a datalogger and wideband 02...BOTH cars begin to misfire and rev bounce at 4000rpm on the dot

currently im running a S14 T28 and his is a redtop T25...we both run stock wastegates and hallman boost controllers...his plugs are one step colder than stock...mine are stock heat range

this is really weird to both of us and we havent been able to pin down exactly what the cause of this problem is...both cars run perfect air/fuel ratios and stay in the stoich range at lower boost levels...power curves are perfect at 12psi

before we put my car on the dyno the last time...we checked for boost leaks with a tool we made...the turbo system is air tight...so PLEASE dont tell me to check for boost leaks

hes running a stock FPR and mine is a Aeromotive FPR...fuel pressure rises properly on mine with boost

we both seem to think it may have something to do with the coilpacks as he has read in a few places that some stock coilpacks just wont handle the spark and some will (kind of random)

both motors have great compression across the board as well

so ne one have any ideas??? i was already saving some money tword Spitfire coilpacks but i wanted some input from people before i ran out and blew 450 bux to solve a problem with the wrong answer

here is a list of mods i currently have on my motor so you can get an idea of what im workin with...

SR20det 2nd Gen Redtop
S14 T28 turbo
MEGAN 02 housing
MEGAN 3 inch downpipe
5Zigen ProRacer Aspec Catback
Greddy TypeS BOV
TREVTEC Hotpipe
TREVTEC Turbo Intake Pipe
HYBRID FMIC kit
CTune Rocker Arm Stoppers
Greddy Intake Manifold
Deatchworks 630cc Injectors
APEX-I PowerFC DJetro
AEROMOTIVE Fuel Pressure Regulator
DENSO Supra TT Fuel Pump
KOYO 55mm Radiator
SAMCO Radiator Hoses
DORKIDORI Water Temp Sensor Adaptor
CTune Air Dam Cover

input please...input =)