Offset versus extra repayments on loans – looking for advice/thoughts…

Just throwing it out there to in hope of some feedback around my current investment property loans. Feel free to throw in your own two cents.. Thank you in advance.

1st loan is my first investment property and is around 206,000

2nd loan is equity release from above loan which is sitting at 117,000.

3rd loan is my newly purchased second investment at 359,000. fixed rate.

All three loans are new due to refinancing and have just under 30 years left (woohoo) and are principal and interest with #3 being fixed.

They way in which these are set up, I have an offset account which I keep savings in to the value of around 55k. This is linked to loan 1. Unfortunately I am unable to link the larger loan #3 to an offset as it is a fixed rate.

This has given me some thoughts around would it be beneficial to keep this simple and just continue adding my savings to my offset account to continue to beef that up (I do have a buffer lump for everyday emergencies and property expenses) – or would it be wise to have a combination of keeping the original offset/adding to it but also make extra repayments on the other two loans, in particular the larger loan #3. I have been mucking around on an Amortization calculator and was surprised at what consistent extra repayments can shave off of the life term of the loan (for example 200 per month and yearly lump sum of 2k seems to shave off around 9 years, allegedly). Now I understand that there are implications when it comes to tax time and extra repayments? I have not yet explored this with my accountant but am keen to hear thoughts if anyone is in a similar situation or experience.

Thanks for your thoughts