3way fridge replacement

I have searched the threads and read most of the information, but still have a
few questions.

I currently have a Dometic 2330, which is next to useless in hot weather. I
have done all the modifications:
1. Made sure condenser fins are within 10mm of rear wall;
2. Filled all relevant cavities with insulation and installed a piece of
aluminium sheet to direct air out of the top vent;
3. Installed a 100mm fan blowing out on the top vent;
4. Installed a small computer chip fan blowing on the internal cooling
fins;
5. Recently removed the internal cooling fins and checked the connection with
the cooling pipe, etc.

On gas and 240 I get about 20 degrees below ambient, which is slightly less than when the fridge was new. Being a Queenslander the inside temperature of the fridge is regularly near 10 degrees in the middle of the day.

I guess I have three options:
1. Buy a new 2350;
2. Get my 2330 repaired;
3. Put up with it.
4. Convert to a 12/240 compressor fridge.

Luckily I have a 50Lt Waeco in the back of the Prado powered by tug and a
second battery and 2 x 85 watt solar panels on the top, which keeps the
essentials at the right temperature.

My question is: Is there a good 3 way tropical rated of similar size to the
2330, 90 litre and how many degrees below ambient can I reasonably expect.

Brian DJ