First of all, nice trainees. Second, as a result of you being in D4 Estonia, you will have an easier time training both guys out of position.
Since you want Vaik to be a PF, I'll start off by recommending that you train his OD to strong (8) to defend against other well-rounded bigs. Next, do 1v1 (Guards or Forwards, your choice) to bring up his HA/DR to at least average (6). JS Guards or Forwards is a good alternative if you don't want to do 1v1. Third, I recommend training PA to average (6).
For Piras, you would have to train him longer. His OD and PA need major work. Without him getting better in these 2 areas, he will be a turnover machine that usually wouldn't be able to defend a jumper to save his life. His HA also need training, and 1v1 will help it increase.
Good luck training both guys!