4L80e swap issues

Every since I've did my 80e swap on my truck I've had nothing but issues. Currently the trans has been went completely through and all new internal parts. Also has a hd2 shift kit. I've had this trans in and out 3 times now. Currently this is my issue :

Trans shifts manually smooth no issues. Still not perfect tho. And when I put it in drive or reverse it doesn't move until like 3k rpm or more. It's almost like it's got a super lose converter. (I know converters good) I'm just about ready to give up. Would the valve body be something that could be causing this issue? That's basically the only original piece left in the trans.. Thanks a ton for any input