Yep thats heavy - you definitely won't loose count working those! I maxxed out at triple 148kg back in 2013 at a bodyweight of 78kg after two years or so of lifting. So not quite double BW but reading my notes from back then it wasn't for want of trying! Leg mass was way up there like you say - I recall having a hard time finding trousers that fit.
You're probably well ahead of me but if you can get your hands on some fractional plates do so - they make such a difference.