I just did my first clen cycle and I am also 6ft 235.
I did 40-40-60-60-80-80-100-100-120-120-100-100-80-80.
didn't feel much till I got to 80 and felt the real shakes and jitters at 100 & 120 - BP and heart rate stayed steady and normal.
Did get some cramps but nothing too bad. Next time I will start at 80 and work it up to 160 - I've read several threads that people 200+ need a larger dose (not recommending that)
I was also taking an EC 3 times a day every other day (before the clen cycle, not during) - that may be the reason I didn't feel anything until 80.
More is not better - start at 40 and up it from there, if you get customs then you will have plenty for several cycles so no need to push it (I've also heard from 1 pro and several "chemically engineered" individuals that usually one cycle is all that works for most people) -
starting round two in about two weeks, so we'll see if they are correct.