I reckon you'll be ok. I'm 30mm down on H&R springs, BBS VZ which are 8 wide, et44 with 225 40 18s. It's nowhere near close to rubbing, even with hard driving.
Adding 6-7mm of poke to the wheel but staying with 225 width tyres would be negligible at 30, 40, or probably 50mm drop.
I didn't get the details of the TDs but from memory they're et45 so the rule above applies.
No issue running 225 40 tyres on 8.5 rims by the way. It's barely any more stretched than a 7.5 or 8 in reality.