Choke tube taper & parallel designs.

With hundreds/thousands of knowledgable shooters on TS.com spending a huge amount of time and effort in seeking out the perfect choke tube design for the best shot patterns, which is the better design ? (a) short choke tube with the taper the full legnth of the choke tube. (b) short choke tube with the taper and then a parallel cylindrical exit diameter. (c) long choke tube with the taper the full legnth of the choke tube. (d) long choke tube with the taper and then a parallel cylindrical exit diameter (e) what would be the increase in the concentration of the shot pattern when using fiber wad cartridges in a straight rifled full choke tube as opposed to using the same fiber wad cartridge in a ordinary full choke tube or is it only that straight rifling reduces fliers. (f) in general terms do faster velosity shot strings with fiber wads produce a larger diameter pattern than lower velosity shot strings with fiber wads. (g) what are the advantages or disadvantages for shot string patterns when the use of plastic cup wads are compaired against the use of ordinary fiber wads. Just seeking your views and looking to find out your experences about choke tube design and the inter-action with the speed of the shot string and the choise of which type of wad is used etc. (bit long winded but you might have some knowledge about the above instead of tackling a crossword) Thanks and kind regards. Philip.