Thanks for your comments. Hiro in UK7,5 is true to size now after a bit breakage, but not relaxed at all. I don't like inserts that is why I'm looking for size that fit very close to TTS. I read that HOK is more relaxed fit from all other lasts and I do not understand how it fit in compare with same size in Hiro. Size for boots I guess is more relaxed than same size and lasts for dress shoes. I have double monks in Hiro and I think it is big difference between boots and monks how it fits. The porblem that it is not possible to change size of MTO boots. Once I had purchased Meermin MTO split toe boots + split toe derby in same last and in same size. Boots were maybe half or full size bigger than shoes and I have to sold them. Now I do not want to repeat this experience.I think if the Hiro is a snug fit for you now, you can go the same size on the HOK with maybe an insert or even an orthopedic insert. If Hiro is not snug and you want to keep a more snug fit you should size down.
Update form Meermin Support
Thank you very much for your message.
From the information you've provided us, we do recommend you to wear a size 7 UK.
If you cannot find your size in website of the shoes you like please let us know the model and we can check in which stage of production is it and give you date for replenishment.
Please, keep in mind this is a suggestion, due to every foot being different we cannot assure 100% that this size will fit you, however, this is the most accurate sizing we can provide.