this is from the thread with the programme on:
Note: you need to choose a suitable amount of weight to be able to perform the required amount of reps, eg if you need to perform 12 reps and you cannot do all 12 reps then the weight is too heavy and visa-versa, when the amount of reps drop on the following set you may have to add weight (pyramid) in order to be able to do that amount of reps, if you can do more then the weight is too light, you must choose the right weight for you according to the amount of reps you will be performing
like i said earlier you must choose a weight where you can do that amount of reps, if the aim is to do 12 reps and and can do more then the weight is too light so you must add until you can do 12, if you cant do 12 then you must take weight off until you can, it is all explained here on the first page
weather this means doing 80% of 1rm to hit 8 reps then so be it, you have to choose the weight accordingly because only you know how much you lift
read the whole thread and alot of questions are answered there:
The ultimate 'GET BIG' programme; weights routine and diet by Killa_Z
also, everything is there for a reason, by changing it you may change the results, e.g calve raises and reverse calve raises, this superset on the antagonistic pair is there to try and help better gains because these muscle work together, by changing this it may not work effectively
follow it as it is on there for a while and if you're still not happy with it, then give it a switch up and change to suit you