Front end swap to USD forks (done and now with pics and write up)

[Punkstig]

It feels a little heavier

Are the forks the same length as originals?
If they're longer this will make the bike feel heavy, dropping the forks through the yokes 5mm at a time then test ride could help.
Tyre pressure (mainly rear) can also make the bike feel heavy.
Other option is to raise the rear with a pair of dog bones!