if you notice week in week out your improving but in small amounts say .05 of second, should you keep the pattern of the workout the same, or increase slightly the intensity and volume, then taper off?
shit i take .05 every single week.
so should i keep weekly pattern the same as is?
hard to say without knowing what you are doing.
2 hi intesity seassions and 2 low int tempo sessions a week.
no weights
If it ain’t broke, don’t fix it.
but you could still upgrade it…
But it is difficult to know exactly how to upgrade the system. 
I think most would take .05 a week, thats not a small amount at all if its week after week.
amounts to shit though as my last meet is in august 12. At this drop rate I won’t or barely reach PB level. I hope i get those rare half second drops if it ever happens hehehe.
If you are improving, why change your plans?
Stuck at your plan, there’s nothing wrong.