Hi Jan it sounds like your waters are warming up and you will be able to pike fish in your Lakes soon ,good luck ! The waters I fish have already warmed quite a bit as spring comes a bit earlier here , there are even some Swallows flying over the Loughs here now.
I do quite a bit of very slow float trolling with baits in the spring as this can sometimes produce the bigger fish here. When it warms a bit more I will switch more to casting Jerkbaits over the rocky reefs in the Loughs .
I also have had some success with trolling Bulldawgs, but have not tried vertical jigging yet .
If I am able to post some photos I will put them on here for you to see , if I cannot get them on this forum I will send some direct to you (I have had problems with posting photos and the system would not allow me to post photos when I tried before)