Switching from Long to Short esters

For the past 9 weeks my cycle has looked like the following:

Week 1 - 4:
Test En - 450mg
Deca - 350mg
Dbol - 40mg ed

Week 5 - 9:
Test En - 600mg
Deca - 420mg
half dose Sunday and Thursday

Now for the next three weeks, I'm planning to switch to Prop and NPP as well as adding Winny at 50mg ed and proviron at the same dose.

What I'd like to know is:
Should I maintain the same dose per week for the shorter acting Test and Nandrolone or should I lower the dose?

Since Winny and Proviron are both derived from DHT will there be some kind of overlap their actions?

Should I stay away from Letro momentarily to save my joints?

Any thoughts will be appreciated.
Thanks