hey dude i put new assembly and pump unit together and now when i stop real hard its almost stalling.i think the bigger assembly springs arent pushed down in all the way and i havent put the black ring back on all the way turned. going to take it off and retry it properly

Looks like you purchased a 525 hellcat unit with P/No: F90000295 (without the check valve) when you really needed P/No: F90000285 (with internal check valve). How did you find the 525 running without upgrading the relays?