Thanks for all the info everyone. I will certainly look into trying to get some of those bigger bricks suggested. 

If you're in the UK, then consider grabbing some of these, is a killer deal for new parts. Maybe a bit slow for 150kHz, but if you're able to lower your Fres then you'll have a lot more options, or you could just try it given it's only 30 quid for 2:

https://www.ebay.co.uk/itm/SKM200GB12V-SEMITRANS-3-VCES-1200-V-IC-200-A/201898900403

(note that I have not bought from this person though, so cannot vouch for them)

I am from the UK and wow are those cheap! Might be worth a try regardless since there's not much to lose cost wise. 

Greetings all!

I'm an electrical & electronic engineering and computer science student from the UK. I have been fascinated with electronics/engineering and creating things from a very early age, and started my high voltage endeavors in 2013 by building Jacobs ladders and Tesla coils. Since then I've spent the vast majority of my free time on all kinds of project's including lasers, hydrogen generators, flyback drivers, Marx generators, high current metal melting transformers, Fusor's, an electric foundry and have built 3 Tesla coils to date. In recent years, I have gravitates a lot more towards microprocessors, digital systems and both high and low level programming. A lot of my projects these days revolve around Arduino's, embedded systems and servers. I suppose my career path right now is headed towards processor micro-architecture and design, as I am currently on my second of three internships with Arm and have always had a deep interest in computer engineering. However, I will definitely continue my interest in power electronics in my spare time; I am currently building my first DRSSTC right now  . I knew our HV community was small, so I am thrilled to see a new forum bursting with activity all these years later with more and more people getting into the subject! 

I document most of my projects on my YouTube and my blog linked here, but I haven't had time yet to update them with some of my older and my most recent experiments:

YouTube Channel - https://www.youtube.com/channel/UCbYNLXCvqlCoLev-WvJ37oQ
Blog - http://halflife390science.blogspot.com/

I look forward to seeing you all around the forum